aibryte-ci: fix broken git diff when run on the main branch

[alafanechere]

Reverts #37641

#37616 introduced a change in the how we checkout the diffed branch and the target branch (which can be a fork).
It did not work when the target branch and the diffed branch are the same (master) as git did not know which branch to checkout as we fetch it from two different remotes targetting the same urls.
This broke the publish pipeline as it runs on master.

The fix is to not fetch the target branch from the target remote if the target branch and the diffed branch have the same name.

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	⬜️ Ignored (Inspect)	Visit Preview		Apr 29, 2024 8:17am

[alafanechere]

• aibryte-ci: fix broken git diff when run on the main branch  #37654 👈
• master

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[alafanechere]

/approve-and-merge reason="bug fix in airbyte-ci to test on master and unblock community-ci + publish"

[octavia-approvington]

Our work here is done

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ExecError: process "git fetch target stephane/05-10-destination-snowflake_bump_cdk_version" did not complete... dagger.client._core in execute View Issue
• ‼️ QueryError: failed to copy: httpReadSeeker: failed open: failed to do request: Get "https://production.cloudf... dagger.client._core in execute View Issue
• ‼️ ExecError: process "git fetch target augustin/05-02-airbyte-ci_set_--yes-auto-update_by_default" did not com... pipelines.dagger.containers.git in checked_out_... View Issue
• ‼️ ExecError: process "git fetch target ng/prettier-no-prose-wrap" did not complete successfully: exit code: 128 pipelines.dagger.containers.git in checked_out_... View Issue
• ‼️ ExecError: process "git fetch target 05-09-bug_registry_fix_slack_notification" did not complete successfull... dagger.client._core in execute View Issue

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