fix: update z-index for intercom app launcher

[osamajandali]

What does this PR do?

• Fixes [CAL-3948] z-index: show intercom below dialogs #15491
• Fixes CAL-3948

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected)
• N/A - I have added a Docs issue here if this PR makes changes that would require a documentation change
• N/A -I have added or modified automated tests that prove my fix is effective or that my feature works (PRs might be rejected if logical changes are not properly tested)

How should this be tested?

This is a UI fix that should be tested by triggering a modal and make sure the modal overlap the intercom icon

[vercel]

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[graphite-app]

Graphite Automations

"Add community label" took an action on this PR • (06/21/24)

1 label was added to this PR based on Keith Williams's automation.

"Add consumer team as reviewer" took an action on this PR • (06/21/24)

1 reviewer was added to this PR based on Keith Williams's automation.

[ThyMinimalDev]

it seems this class already sets the highest possible z-index, in which browser is this issue happening ?

[skmanoj322]

@osamajandali i have tried to reproduce the error but not able to find intercom in dev but in production i am able to see that.
can you please tell how you reproduced?

[osamajandali]

@ThyMinimalDev if you take a look into the issue Peer want it to be underneath the modal so people can hit Copy code button easily if there is an overlap happens

@skmanoj322 You need to add intercom app id in .env

[sean-brydon]

LGTM thanks :)