feat(button): add secondary button ghost variant

[endv-bogdanb]

Description

Implements button secondary ghost styling.

Related Issue

Documentation

Screenshots (if applicable)

Checklist

• I have read the CONTRIBUTING document.
• I have read the CODE OF CONDUCT document.
• I have reviewed my own 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=4c4f9ff7f364a15ddd4c38f0bdeb3d0660b000ef --head=97f858404256fb4c590cd01f6e178341b5d70df3 --ci --code-coverage --runInBand
• nx affected -t test --exclude=*,!tag:core --parallel=3 --base=4c4f9ff7f364a15ddd4c38f0bdeb3d0660b000ef --head=97f858404256fb4c590cd01f6e178341b5d70df3 --ci --runInBand
• nx affected -t lint --exclude=*,!tag:publishable --parallel=3 --base=4c4f9ff7f364a15ddd4c38f0bdeb3d0660b000ef --head=97f858404256fb4c590cd01f6e178341b5d70df3
• nx affected -t build --exclude=*,!tag:publishable --parallel=3 --base=4c4f9ff7f364a15ddd4c38f0bdeb3d0660b000ef --head=97f858404256fb4c590cd01f6e178341b5d70df3

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud