publish release note for v1.14.0-alpha.2

[zhzhuang-zju]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
According to Karmada's release cycle, the release team is preparing to release v1.14.0-alpha.2. This pr is used to publish its release notes.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None.

[zhzhuang-zju]

I add both #6286 and #6287 to the release notes as they introduce user-facing changes. Can they also be updated in the description of the corresponding PR?

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.13%. Comparing base (1417bef) to head (7e309cf).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6301      +/-   ##
==========================================
+ Coverage   48.12%   48.13%   +0.01%     
==========================================
  Files         678      678              
  Lines       56077    56077              
==========================================
+ Hits        26985    26995      +10     
+ Misses      27321    27313       -8     
+ Partials     1771     1769       -2     

Flag	Coverage Δ
unittests	48.13% <ø> (+0.01%)	⬆️

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[RainbowMango]

I add both #6286 and #6287 to the release notes as they introduce user-facing changes. Can they also be updated in the description of the corresponding PR?

OK. I can do it.

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

[Copilot]

Typo detected in 'MultiClusterSerivce'; consider correcting to 'MultiClusterService'.

Suggested change

	- `karmada-controller-manager`: when cluster is not-ready doesn't clean MultiClusterSerivce and EndpointSlice work. ([#6258](https://github.com/karmada-io/karmada/pull/6258), @XiShanYongYe-Chang)
	- `karmada-agent`: Fixed the issue where a new pull-mode cluster may overwrite the existing member clusters. ([#6253](https://github.com/karmada-io/karmada/pull/6253), @zhzhuang-zju)
	- `karmada-controller-manager`: when cluster is not-ready doesn't clean MultiClusterService and EndpointSlice work. ([#6258](https://github.com/karmada-io/karmada/pull/6258), @XiShanYongYe-Chang)

[RainbowMango]

I updated the original PR. cc @XiShanYongYe-Chang

[zhzhuang-zju]

All Done~

[Copilot]

Pull Request Overview

This documentation PR introduces the release notes for v1.14.0-alpha.2 by updating the CHANGELOG file.

• Adds a new section for v1.14.0-alpha.2 with Downloads, Changelog, Urgent Update Notes, and Changes by Kind.
• Adjusts the table of contents to include both v1.14.0-alpha.2 and v1.14.0-alpha.1 entries.

[RainbowMango]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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• docs/CHANGELOG/OWNERS [RainbowMango]

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