[Release-1.26] CLI + Config Enhancement

[dereknola]

Proposed Changes

Backports of:

• Handle multiple arguments with StringSlice flags #7380
• Enable FindString to search dotD config files #7323

Types of Changes

CLI Fixes

Verification

See linked issues

Testing

Linked Issues

#7396
#7395

User-Facing Change

* `--tls-sans` now accepts multiple arguments: `--tls-sans="foo,bar"`
* `prefer-bundled-bin: true` now works properly when set in `config.yaml.d` files

Further Comments

[codecov]

Codecov Report

Patch coverage: 46.15% and project coverage change: +0.12 🎉

Comparison is base (42fd1bf) 9.82% compared to head (0e5eec1) 9.94%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.26   #7403      +/-   ##
===============================================
+ Coverage          9.82%   9.94%   +0.12%     
===============================================
  Files               147     147              
  Lines             10845   10861      +16     
===============================================
+ Hits               1065    1080      +15     
- Misses             9558    9559       +1     
  Partials            222     222              

Flag	Coverage Δ
unittests	9.94% <46.15%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cli/server/server.go	0.00% <0.00%> (ø)
pkg/configfilearg/parser.go	74.53% <75.00%> (-0.47%)	⬇️
pkg/util/client.go	25.00% <100.00%> (+25.00%)	⬆️

... and 1 file with indirect coverage changes

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