Daniel lee/delete telemetry after downlink

[GitWorkingTime]

Purpose

Closes #394
Explain the purpose of the PR here if it doesn't match the linked issue. Be sure to add a comment in the linked issue explaining the changes.

"Telemetry files don't delete after it's been downlinked. Currently working on fixing that"

New Changes

Explain new changes below in short bullet points.

• Created a new function deleteSelectedTelemetryFile(const char *filePath) in telemetry_fs_utils.c
• Included said function in telemetry_fs_utils.h

Testing

Explain tests that you ran to verify code functionality.

• I have unit-tested this PR. Otherwise, explain why it cannot be unit-tested.
• I have tested this PR on a board if the code will run on a board (Only required for firmware developers).
• I have tested this PR by running the ARO website (Only required if the code will impact the ARO website).
• I have tested this PR by running the MCC website (Only required if the code will impact the MCC website).
• I have included screenshots of the tests performed below.

Uhhh it builds

Outstanding Changes

If there are non-critical changes (i.e. additional features) that can be made to this feature in the future, indicate them here.

[github-actions]

Pull reviewers stats

Stats of the last 120 days for UWOrbital:

	User	Total reviews	Time to review	Total comments
	Adityya-K 🥇	41 ▀▀▀▀	3d 5h 53m ▀	112 ▀▀▀
	camspec 🥈	38 ▀▀▀	2d 20h 40m ▀	222 ▀▀▀▀▀
	proprogrammer504 🥉	13 ▀	7d 1h 30m ▀▀	44 ▀
	kepler452b123	8 ▀	1d 18h 25m ▀	24 ▀
	Syzygicality	8 ▀	9h 7m	17
	joannalauu	3	4d 21h 20m ▀	19
	c4bae	1	13d 1h 35m ▀▀▀▀	2
	panthpatel2016	1	4h 30m	6

^{⚡️ Pull request stats}