Remove Process related metrics from .NET Runtime metrics

[xiang17]

For #335.

Changes

Remove Process related metrics from .NET Runtime metrics.

These metrics should be added in a separate package and with OpenTelemetry.Instrumentation.Process as a potential name.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue [Do Not Merge] Add description doc for DotNet Runtime metrics #404 (comment)

[codecov]

Codecov Report

Merging #446 (08047ae) into main (ff1033a) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #446   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files        163     163           
  Lines       4909    4898   -11     
=====================================
+ Misses      4909    4898   -11     

Impacted Files	Coverage Δ
...elemetry.Instrumentation.Runtime/RuntimeMetrics.cs	0.00% <ø> (ø)
...y.Instrumentation.Runtime/RuntimeMetricsOptions.cs	0.00% <ø> (ø)