[Enhance] enhance fetch worksheet by title parsing, improve code readability

[mdirfan40]

What type of PR is this?

i wan to Fix #6409

• don't use mixed-type variables
• allow for non-quoted worksheet titles (single word)
• verify 0/1 indexing of worksheet numbers, and add comment if it differs

• Refactor
• Feature
• Bug Fix
• New Query Runner (Data Source)
• New Alert Destination
• Other

How is this tested?

• Unit tests (pytest, jest)
• E2E Tests (Cypress)
• Manually
• N/A

[mdirfan40]

Getting this error while back lint check how to fix it ?

Oh no! 💥 💔 💥
1 file would be reformatted, 252 files would be left unchanged.

[justinclift]

Getting this error while back lint check how to fix it ?

Did you set up your development environment using this wiki page?

https://github.com/getredash/redash/wiki/Local-development-setup

There's a section at the bottom of that which talks about the "Configuring "Pre-commit":

https://github.com/getredash/redash/wiki/Local-development-setup#configuring-pre-commit

I think that's the piece which takes care of formatting issues (the "lint" check things).

[mdirfan40]

Any feedback and changes required to merge this PR ?