[Release-1.31] Remove experimental from embedded-registry flag

[dereknola]

Backport #11443

Proposed Changes

• Move Spegel (embedded-registry) to GA status in CLI. Docs will be update according to note it went GA in December 2024 releases.

Types of Changes

CLI

Verification

k3s server --help shows embedded-registry no longer has the experimental tag

Testing

Linked Issues

TBD

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.32%. Comparing base (6e6af98) to head (2277de1).
Report is 2 commits behind head on release-1.31.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.31   #11444      +/-   ##
================================================
- Coverage         47.11%   42.32%   -4.80%     
================================================
  Files               179      179              
  Lines             18568    18568              
================================================
- Hits               8749     7858     -891     
- Misses             8468     9517    +1049     
+ Partials           1351     1193     -158     

Flag	Coverage Δ
e2etests	33.97% <ø> (-8.16%)	⬇️
inttests	34.70% <ø> (-0.05%)	⬇️
unittests	13.85% <ø> (ø)

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