In the tags command, print percentages relative to profile total.

[aalexand]

Before this change percentages were relative to the tag total and this sometimes causes confusion for users as it makes it look like the tag is set for all samples when it's not.

Note that the percentage calculation as implemented does not attempt to be friendly to samples where a given tag has multiple values. Multiple values per tag per sample are discouraged and we should deprecate them. Maybe we should make pprof print a warning for such profiles.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 66.91%. Comparing base (0ed6a68) to head (4a63a5c).
Report is 65 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/report/report.go	0.00%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
+ Coverage   66.86%   66.91%   +0.04%     
==========================================
  Files          44       44              
  Lines        9824     9871      +47     
==========================================
+ Hits         6569     6605      +36     
- Misses       2794     2827      +33     
+ Partials      461      439      -22     

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[ghemawat]

Looks good.