fix: remove the Export CSV feature from the WebUI

[ironAiken2]

This PR resolves #2985 issue.

Changes:

• Since WebUI version "24.12.0", the WebUI no longer provides the export CSV feature. For this reason, I removed all existing export CSV functionality.
• Since the session log modal uses the downloadBlob function, I did not delete that function.

Checklist: (if applicable)

• Mention to the original issue
• Documentation
• Minium required manager version
• Specific setting for review (eg., KB link, endpoint or how to setup)
• Minimum requirements to check during review
• Test case(s) to demonstrate the difference of before/after

[ironAiken2]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix: remove the Export CSV feature from the WebUI #2984 👈 (View in Graphite)
• feat: remove legacy user/credential components #2755 : 1 other dependent PR (#2961 )
• feat: keypair info/setting modal in credential page #2940
• feat: migrate user credential list to react component #2758
• feat: user list using user_nodes query #2934
• feat: migrate /credentials page to react component #2757
• feat: migrate create user modal into react component #2754
• main

---

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• flow:merge-queue - adds this PR to the back of the merge queue
• flow:hotfix - for urgent hot fixes, skip the queue and merge this PR next

You must have a Graphite account in order to use the merge queue. Sign up using this link.

An organization admin has required the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.

This stack of pull requests is managed by Graphite. Learn more about stacking.