only enable service import/export controllers after EndpointSlice v1beta1 promoted

[mars1024]

Signed-off-by: Bruce Ma brucema19901024@gmail.com

What type of PR is this?

/bugfix

What this PR does / why we need it:

To enable controllers iff necessary.

Which issue(s) this PR fixes:

Fixes #519

Special notes for your reviewer:

[mars1024]

/assign @dixudx

[mars1024]

/retest

[codecov-commenter]

Codecov Report

Merging #529 (0960b56) into main (c4a855b) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #529      +/-   ##
==========================================
+ Coverage   13.55%   13.58%   +0.03%     
==========================================
  Files          65       65              
  Lines        7120     7148      +28     
==========================================
+ Hits          965      971       +6     
- Misses       6079     6101      +22     
  Partials       76       76              

Impacted Files	Coverage Δ
...rc/github.com/clusternet/clusternet/pkg/hub/hub.go	2.51% <0.00%> (-0.08%)	⬇️
...ithub.com/clusternet/clusternet/pkg/agent/agent.go	1.61% <0.00%> (-0.05%)	⬇️
...hub.com/clusternet/clusternet/pkg/utils/version.go	100.00% <0.00%> (ø)

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[dixudx]

Good work! Thanks for the contribution.