Changelog v48.1.0

[lcampos]

What does this PR do?

Update change log for release 48.1.0

[codecov]

Codecov Report

Merging #1989 into release/v48.1.0 will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release/v48.1.0   #1989   +/-   ##
===============================================
  Coverage               75%     75%           
===============================================
  Files                  225     225           
  Lines                 8283    8283           
  Branches               922     922           
===============================================
  Hits                  6213    6213           
- Misses                1836    1838    +2     
+ Partials               234     232    -2

Impacted Files	Coverage Δ
...code-lwc/src/testSupport/testRunner/testWatcher.ts	80% <0%> (-2.86%)	⬇️
...forcedx-vscode-core/src/channels/channelService.ts	85.71% <0%> (+2.38%)	⬆️

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