feat!: use for_each instead of count

[mehdicopter]

Hello,
Please be indulgent this is my first PR in a terraform module.
I know there might be work left to do.
I invite you to review my PR and improve my work :)

Thanks

[google-cla]

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[apeabody]

Thanks for the contribution @mehdicopter!

Prior to review, can you please address the lint findings.

[github-actions]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[mehdicopter]

Reopen please

[mehdicopter]

I'll take care of conflicts asap

[github-actions]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days