[CI] Add `project/sistent` label automatically to pull requests related to sistent project

[sudhanshutech]

Desired Behavior

If there any change happens meanings any pull requests within sistent here -> https://layer5.io/projects/sistent then the github bot should automatically labelled with project/sistent.

Screenshots / Mockups

Implementation

Acceptance Tests

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[Vidit-Kushwaha]

Hi @sudhanshutech I like to work for this issue

[thiha-min-thant]

Hi @sudhanshutech , can you please assign me?