fix: open all links in new tab in embed view - fixes #4214

[faratabassum09-a11y]

What does this PR do?

Fixes #4214

Changes made

• Added JavaScript to app/views/tag/gridsEmbed.html.erb that sets target="_blank" and rel="noopener noreferrer" on all anchor tags
• This ensures links in embedded grids open in a new tab instead of loading inside the iframe
• The fix only applies to the embed view, not normal inline grids

Checklist

• Tested the change locally
• No existing functionality broken
• The fix is scoped only to the embed view

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[faratabassum09-a11y]

Hi maintainers!
I'm a new contributor working toward GSoC 2027.
Could someone please review this PR when they get a chance?
The failing tests appear to be pre-existing Ruby/Rails test failures
unrelated to my JavaScript change in gridsEmbed.html.erb.
Thank you!

[faratabassum09-a11y]

This PR fixes #4214

Adds JavaScript to gridsEmbed.html.erb to ensure all links
open in a new tab when viewed in embed mode, preventing
the iframe from loading entire pages within itself.