fix: border issue for expandable interactive tile for feature flags

[riddhybansal]

Closes #15940

Since the entire tile is not clickable, the border should be around the button instead of being around the tile

Changelog

New

• Added border to button for expandable interactive tile for feature flags

Removed

• Removed border from the whole expandable interactive tile since its not clickable

Testing / Reviewing

Go to Feature Flags -> Tile -> Expandable With Interactive Tile

• Tile should not have the border instead there should be border on the chevron button
• These styles should not effect any other type of tile whether in feature flags or a normal component
• Same styles should be present in the component using the Expandable With Interactive Tile (Ex: Expandable with Layer in feature flags)

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[thyhmdo]

Looks great! Thank you

[alisonjoseph]

LGTM!