Added unique IDs to expander landmarks

[harsha573252]

Releated Jira

https://swicloud.atlassian.net/browse/OO-50773

Frontend Pull Request Description

Expander: Add unique IDs to region landmarks with aria-label

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have updated change log
• I have been following Definition of done
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new lint warnings
• New and existing unit tests pass locally and on CI with my changes
• Any dependent changes have been merged and published in downstream modules

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Additional Context (if necessary)