fix: Resolve virtual rendering focus issues (WPB-15154)

[thisisamir98]

WPB-15154 [Web] Improve loading of conversation list by only loading what is visible in viewport

Description

• changed align behavior of scrollToIndex of rowVirtualizer to auto to avoid always bringing the conversation in center even in cases they are already visible
• removed useEffect for focusing as it was causing unexpected focus jumping behavior and it had no use case when opening a folder

[przemvs]

LGTM!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 45.95%. Comparing base (c4599fa) to head (a3cd9a7).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #18688      +/-   ##
==========================================
- Coverage   45.98%   45.95%   -0.03%     
==========================================
  Files         894      894              
  Lines       27405    27411       +6     
  Branches     6187     6188       +1     
==========================================
- Hits        12601    12596       -5     
- Misses      13239    13250      +11     
  Partials     1565     1565