remove unused "timelineArray" variable

[Jperparas]

Fixes #6642

What changes did you make?

• deleted unused variable "timelineArray" in github-actions/trigger-schedule/add-update-label-weekly/add-label.js

Why did you make the changes (we will use this info to test)?

• To resolve CodeQL alert 53 that referenced an unused variable in github-actions/trigger-schedule/add-update-label-weekly/add-label.js
• removing unused code helps improve readability and performance

Screenshots of Proposed Changes Of The Website (if any, please do not screen shot code changes)

• No visual changes, an unused variable was deleted.

[github-actions]

Want to review this pull request? Take a look at this documentation for a step by step guide!

From your project repository, check out a new branch and test the changes.

git checkout -b Jperparas-resolve-codeql-alert53-6642 gh-pages
git pull https://github.com/Jperparas/website.git resolve-codeql-alert53-6642

---

Note that CONTRIBUTING.md cannot previewed locally; rather it should be previewed at this URL:

https://github.com/Jperparas/website/blob/resolve-codeql-alert53-6642/CONTRIBUTING.md  

[aidanwsimmons]

ETA- EOD Monday
Availability- weekday afternoons

[JackCasica]

Hi ~ I'll be reviewing this PR tomorrow ~
Availability: (04/22)
ETA: EOD (04/22)

[aidanwsimmons]

Hey Jperparas-

• branch naming done properly
• issue correctly linked
• changes align with your recommendation for the codeql alert resolution
• summaries are clear and concise

Nice job -Approved!

[JackCasica]

Hi ~ In this PR, you...

• Removed the unused variable timelineArray mentioned in issue Resolve CodeQL alert 53 #6642 ✅

PR Approved!