fix: prevent duplicate calendar account linking

[Amit91848]

What does this PR do?

Fixes #13302

• Bug fix (non-breaking change which fixes an issue)

Mandatory Tasks

• [x] Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

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📦 Next.js Bundle Analysis for @calcom/web

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[emrysal]

Hey @Amit91848 I wonder if there is a way to make this into a utility to prevent code duplication; also wondering if the check can be done before credential creation as this is undone later.

[Amit91848]

@Udit-takkar for lark if user tries to sign in using the same account, new credentials are overwriting the older ones. Should I change this? Will check for others.

[Amit91848]

@emrysal made changes.

[github-actions[bot]]

Hey there, there is a merge conflict, can you take a look?