add tls min/max version to grpc proxy

[tjungblu]

This adds the min and max TLS version support from #13506 and #15156 to the grpc proxy.

Fixes #13506

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

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Codecov Report

Attention: Patch coverage is 6.45161% with 29 lines in your changes missing coverage. Please review.

Project coverage is 68.65%. Comparing base (ee88ecc) to head (c99dcd4).
Report is 10 commits behind head on main.

❗ Current head c99dcd4 differs from pull request most recent head 463eef9

Please upload reports for the commit 463eef9 to get more accurate results.

Files with missing lines	Patch %	Lines
server/etcdmain/grpc_proxy.go	6.45%	29 Missing ⚠️

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Additional details and impacted files

Files with missing lines	Coverage Δ
server/etcdmain/grpc_proxy.go	14.52% <6.45%> (-0.53%)	⬇️

... and 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18816      +/-   ##
==========================================
- Coverage   68.74%   68.65%   -0.10%     
==========================================
  Files         420      420              
  Lines       35523    35549      +26     
==========================================
- Hits        24422    24407      -15     
- Misses       9673     9706      +33     
- Partials     1428     1436       +8     

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[ahrtr]

LGTM

The change looks good, but unfortunately there is no test cases.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, tjungblu

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[tjungblu]

happy to add some in a separate PR, because for grpc proxy we have almost nothing 🙀

[tjungblu]

just added a basic e2e that those flags work for starting the proxy process

[tjungblu]

/retest

[jmhbnz]

/retest