[Release-1.29] 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 41.29%. Comparing base (666b590) to head (ddc4a29).
Report is 2 commits behind head on release-1.29.

❗ There is a different number of reports uploaded between BASE (666b590) and HEAD (ddc4a29). Click for more details.

HEAD has 36 uploads less than BASE

Flag	BASE (666b590)	HEAD (ddc4a29)
inttests	33	11
unittests	3	1
e2etests	18	6

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.29   #11446      +/-   ##
================================================
- Coverage         46.72%   41.29%   -5.43%     
================================================
  Files               179      179              
  Lines             18720    18720              
================================================
- Hits               8746     7731    -1015     
- Misses             8617     9798    +1181     
+ Partials           1357     1191     -166     

Flag	Coverage Δ
e2etests	32.42% <ø> (-9.78%)	⬇️
inttests	18.82% <ø> (-15.95%)	⬇️
unittests	13.74% <ø> (ø)

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