docs: Add upgrading guide for TLS metrics for 3.3

[simster7]

Related to: #7041

Signed-off-by: Simon Behar simbeh7@gmail.com

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[simster7]

Will add commit once #7041 is merged

[simster7]

Do not merge before #7041

[codecov]

Codecov Report

Merging #7051 (0f95790) into master (31bf57b) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7051      +/-   ##
==========================================
+ Coverage   48.48%   48.52%   +0.04%     
==========================================
  Files         265      265              
  Lines       19307    19307              
==========================================
+ Hits         9361     9369       +8     
+ Misses       8889     8882       -7     
+ Partials     1057     1056       -1     

Impacted Files	Coverage Δ
workflow/controller/operator.go	71.29% <0.00%> (+0.14%)	⬆️
cmd/argo/commands/get.go	59.18% <0.00%> (+0.29%)	⬆️
workflow/controller/workflowpod.go	74.41% <0.00%> (+0.51%)	⬆️

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