feat: Add cancelledBy input to cancellation page

[iharsh02]

What does this PR do?

• Fixes [CAL-5045] Add cancelledBy input to cancellation page #18717 (GitHub issue number)
• Fixes CAL-5045 (Linear issue number - should be visible at the bottom of the GitHub issue description)

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Are there environment variables that should be set?
• What are the minimal test data to have?
• What is expected (happy path) to have (input and output)?
• Any other important info that could help to test that PR

Checklist

• I haven't read the contributing guide
• My code doesn't follow the style guidelines of this project
• I haven't commented my code, particularly in hard-to-understand areas
• I haven't checked if my changes generate no new warnings

cal-5045.mp4

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[github-actions]

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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (01/20/25)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (01/20/25)

1 label was added to this PR based on Keith Williams's automation.

[iharsh02]

@Praashh sorry for the last PR , what happened their was not suppose to happen truly embarrassing 🙏

[Praashh]

why are we setting these ? can you please tell me?

[iharsh02]

in case user , tried to verify with an incorrect email, saw an error msg , then close the dialog and later user open the cancel dialog (so he will not see the same error msg again before verifying the email)

[Praashh]

LGTM! tagging @anikdhabal for a final touch..