[size-report] migrate to GitHub Actions

[bukepo]

This PR is to verify the size report changes.

Depends-On: openthread/ot-nrf528xx#989

[gemini-code-assist]

Summary of Changes

Hello @bukepo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the script/check-size utility by removing its integration with the OT_REPORTER external size reporting mechanism. This change is a foundational step in migrating the project's size reporting capabilities to a GitHub Actions-based workflow, aiming for a more integrated and modern CI/CD approach.

Highlights

• Deprecation of OT_REPORTER integration: The OT_REPORTER variable and all associated calls (initialization, size reporting, and post-processing) have been removed from the script/check-size utility. This indicates the removal of an older, external size reporting mechanism.
• Preparation for GitHub Actions migration: This change is a preparatory step towards migrating the project's size reporting infrastructure to GitHub Actions, as indicated by the pull request title. The script/check-size is being cleaned up to remove dependencies on the previous reporting system.

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[gemini-code-assist]

Code Review

The code changes remove the OT_REPORTER variable and related logic from the check-size script. The script defines several functions before they are called, which is not ideal. It's better to define functions before they are called to ensure that the function definition is available when it is needed.

[gemini-code-assist]

The finalize_report function is being defined before it is being called. This can lead to unexpected behavior if the function is modified later in the script. It's best practice to define functions before they are called to ensure that the function definition is available when it is needed. Consider moving this function definition to the top of the script.

[github-actions]

Merging #19 into main

name	branch	text	data	bss	total
ot-cli-ftd	3fa8a2a	478264	860	66524	545648
	14c8134	478264	860	66628	545752
	+/-	+0	+0	+104	+104
ot-ncp-ftd	3fa8a2a	444140	764	61768	506672
	14c8134	444140	764	61872	506776
	+/-	+0	+0	+104	+104
ot-cli-mtd	3fa8a2a	371328	764	50988	423080
	14c8134	371344	764	50988	423096
	+/-	+16	+0	+0	+16
ot-ncp-mtd	3fa8a2a	352444	764	46256	399464
	14c8134	352460	764	46256	399480
	+/-	+16	+0	+0	+16
ot-cli-ftd-br	3fa8a2a	575704	868	134036	710608
	14c8134	575736	868	134140	710744
	+/-	+32	+0	+104	+136
ot-rcp	3fa8a2a	63120	568	20804	84492
	14c8134	63136	568	20804	84508
	+/-	+16	+0	+0	+16

Library files

name	branch	text	data	bss	total
libopenthread-ftd.a	3fa8a2a	245496	95	40302	285893
	14c8134	245496	95	40406	285997
	+/-	+0	+0	+104	+104
libopenthread-cli-ftd.a	3fa8a2a	60743	0	8083	68826
	14c8134	60743	0	8083	68826
	+/-	+0	+0	+0	+0
libopenthread-ncp-ftd.a	3fa8a2a	33257	0	5948	39205
	14c8134	33257	0	5948	39205
	+/-	+0	+0	+0	+0
libopenthread-mtd.a	3fa8a2a	164143	0	24790	188933
	14c8134	164143	0	24790	188933
	+/-	+0	+0	+0	+0
libopenthread-cli-mtd.a	3fa8a2a	41134	0	8059	49193
	14c8134	41134	0	8059	49193
	+/-	+0	+0	+0	+0
libopenthread-ncp-mtd.a	3fa8a2a	25785	0	5948	31733
	14c8134	25785	0	5948	31733
	+/-	+0	+0	+0	+0
libopenthread-ftd-br.a	3fa8a2a	346725	100	107782	454607
	14c8134	346777	100	107886	454763
	+/-	+52	+0	+104	+156
libopenthread-cli-ftd-br.a	3fa8a2a	75982	0	8115	84097
	14c8134	75982	0	8115	84097
	+/-	+0	+0	+0	+0
libopenthread-rcp.a	3fa8a2a	9932	0	5060	14992
	14c8134	9932	0	5060	14992
	+/-	+0	+0	+0	+0
libopenthread-radio.a	3fa8a2a	19383	0	238	19621
	14c8134	19383	0	238	19621
	+/-	+0	+0	+0	+0

[github-actions]

+----------------------------+----------+----------+----------+----------+----------+
| name | branch | text | data | bss | total |
+============================+==========+==========+==========+==========+==========+
| ot-cli-ftd | b876687 | 477232 | 860 | 66524 | 544616 |
| | 498fd37 | 477232 | 860 | 66524 | 544616 |
| | +/- | +0 | +0 | +0 | +0 |
+----------------------------+----------+----------+----------+----------+----------+
| ot-ncp-ftd | b876687 | 443108 | 764 | 61768 | 505640 |
| | 498fd37 | 443108 | 764 | 61768 | 505640 |
| | +/- | +0 | +0 | +0 | +0 |
+----------------------------+----------+----------+----------+----------+----------+
| ot-cli-mtd | b876687 | 370312 | 764 | 50988 | 422064 |
| | 498fd37 | 370312 | 764 | 50988 | 422064 |
| | +/- | +0 | +0 | +0 | +0 |
+----------------------------+----------+----------+----------+----------+----------+
| ot-ncp-mtd | b876687 | 351428 | 764 | 46256 | 398448 |
| | 498fd37 | 351428 | 764 | 46256 | 398448 |
| | +/- | +0 | +0 | +0 | +0 |
+----------------------------+----------+----------+----------+----------+----------+
| ot-cli-ftd-br | b876687 | 574696 | 868 | 134036 | 709600 |
| | 498fd37 | 574696 | 868 | 134036 | 709600 |
| | +/- | +0 | +0 | +0 | +0 |
+----------------------------+----------+----------+----------+----------+----------+
| ot-rcp | b876687 | 62992 | 568 | 20804 | 84364 |
| | 498fd37 | 62992 | 568 | 20804 | 84364 |
| | +/- | +0 | +0 | +0 | +0 |
+----------------------------+----------+----------+----------+----------+----------+