feat: Remove room header avatar

[dougfabris]

Proposed changes (including videos or screenshots)

Important

This change is under feature preview

Issue(s)

Steps to test or reproduce

• Enable newNavigation feature preview
• Open any room
• Should not display the avatar in the room header

Further comments

SIDE2-40

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is targeting the wrong base branch. It should target 7.6.0, but it targets 7.5.0

Please fix the issues and try again

If you have any trouble, please check the PR guidelines

[changeset-bot]

🦋 Changeset detected

Latest commit: 061366a

The changes in this PR will be included in the next version bump.

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[github-actions]

PR Preview Action v1.6.0
🚀 View preview at https://RocketChat.github.io/Rocket.Chat/pr-preview/pr-35615/
Built to branch gh-pages at 2025-03-26 00:04 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.73%. Comparing base (f271b56) to head (061366a).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #35615   +/-   ##
========================================
  Coverage    59.73%   59.73%           
========================================
  Files         2830     2830           
  Lines        68257    68257           
  Branches     15129    15129           
========================================
  Hits         40772    40772           
  Misses       24877    24877           
  Partials      2608     2608           

Flag	Coverage Δ
unit	75.92% <ø> (ø)

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