refactor celery task names to constants

[rkuo-danswer]

Description

Fixes DAN-1056. Refactoring hard coded task names into string constants.

How Has This Been Tested?

[Describe the tests you ran to verify your changes]

Accepted Risk (provide if relevant)

N/A

Related Issue(s) (provide if relevant)

N/A

Mental Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

Backporting (check the box to trigger backport action)

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• This PR should be backported (make sure to check that the backport attempt succeeds)

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 1, 2024 11:25pm