fix(Alert): make close icon customizable via slot

[dgonzalezr]

Description

This pull request enables users to specify an alternative close button for the Alert component through a slot, particularly when using a custom icon library.

Related Issue

Fixes #ISSUE_NUMBER

Documentation

Screenshots (if applicable)

Checklist

• I have read the CONTRIBUTING document.
• I have read the CODE OF CONDUCT document.
• I have reviewed my code.
• I have tested the changes locally.
• I have updated the documentation (if applicable).
• I have added unit tests and e2e tests (if applicable).
• I have requested reviews from relevant team members.

Additional Notes

[nx-cloud]

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✅ Successfully ran 5 targets

• nx run beeq:storybook-build --output-style=stream-without-prefixes
• nx affected -t e2e --exclude=*,!tag:core --parallel=3 --base=aa469d667a737173911ea93da523001f609bd751 --head=f3ae5817bcceac56813aa95881e5935a7427ab58 --ci --code-coverage --runInBand
• nx affected -t test --exclude=*,!tag:core --parallel=3 --base=aa469d667a737173911ea93da523001f609bd751 --head=f3ae5817bcceac56813aa95881e5935a7427ab58 --ci --runInBand
• nx affected -t lint --exclude=*,!tag:publishable --parallel=3 --base=aa469d667a737173911ea93da523001f609bd751 --head=f3ae5817bcceac56813aa95881e5935a7427ab58
• nx affected -t build --exclude=*,!tag:publishable --parallel=3 --base=aa469d667a737173911ea93da523001f609bd751 --head=f3ae5817bcceac56813aa95881e5935a7427ab58

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Sent with 💌 from NxCloud.

[Cata1989]

LGTM 👍

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud