rename user container to main container

[EraKin575]

Fixes #15007

Proposed Changes

*Renamed all UserContainer occurences to MainContainer in pkg package
*
*

Release Note

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: EraKin575
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[knative-prow]

Welcome @EraKin575! It looks like this is your first PR to knative/serving 🎉

[knative-prow]

Hi @EraKin575. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[dprotaso]

/hold we shouldn't be duplciating work

#15007 (comment)

[EraKin575]

@dprotaso I think we can remove this from hold now

[dprotaso]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.59%. Comparing base (1f7cc48) to head (5b1179f).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15330      +/-   ##
==========================================
- Coverage   84.78%   84.59%   -0.19%     
==========================================
  Files         218      219       +1     
  Lines       13504    13584      +80     
==========================================
+ Hits        11449    11492      +43     
- Misses       1688     1726      +38     
+ Partials      367      366       -1     

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[knative-prow]

@EraKin575: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
istio-latest-no-mesh_serving_main	5b1179f	link	true	/test istio-latest-no-mesh

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