chore(kuma-dp): cleanup bootstrap version field

[tharun208]

Summary

This PR deletes the BootstrapVersion field from BootstrapRequest.

Full changelog

• Removed the BootstrapVersion field
• Updated tests

Issues resolved

Fix #2986

Documentation

• Link to the website documentation PR

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

Backwards compatibility

• Update UPGRADE.md with any steps users will need to take when upgrading.
• Add backport-to-stable label if the code follows our backporting policy

[codecov-commenter]

Codecov Report

Merging #3670 (e91230c) into master (08cde76) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3670      +/-   ##
==========================================
- Coverage   56.13%   56.10%   -0.03%     
==========================================
  Files         918      918              
  Lines       55044    55043       -1     
==========================================
- Hits        30900    30883      -17     
- Misses      21694    21713      +19     
+ Partials     2450     2447       -3     

Impacted Files	Coverage Δ
...pp/kuma-dp/pkg/dataplane/envoy/remote_bootstrap.go	60.57% <ø> (-0.38%)	⬇️
pkg/insights/components.go	70.00% <0.00%> (-30.00%)	⬇️
pkg/events/eventbus.go	85.18% <0.00%> (-7.41%)	⬇️
pkg/kds/reconcile/reconciler.go	79.48% <0.00%> (-5.13%)	⬇️
...s/authn/api-server/tokens/admin_token_bootstrap.go	78.00% <0.00%> (-4.00%)	⬇️
pkg/insights/resyncer.go	71.16% <0.00%> (-2.46%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	89.65% <0.00%> (-1.15%)	⬇️
pkg/plugins/runtime/gateway/route/sorter.go	71.79% <0.00%> (+5.12%)	⬆️

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[lahabana]

I think this makes sense @lobkovilya can you double check as the TODO was coming from you :)

[lobkovilya]

If I recall correctly, we didn't release Kuma with Envoy 1.20 (even though it's in master for a while). We've left this field for compatibility reasons, so new kuma-dp could request an old kuma-cp. So I think we should postpone merging this PR.

[lahabana]

@lobkovilya now that we are running 1.21 can we do this? Or should we wait another release?

[jakubdyszkiewicz]

@tharun208 we are ready to merge it, but could you merge the newest origin/master before it?

[tharun208]

@jakubdyszkiewicz done 👍🏻

[lahabana]

@Mergifyio update

[mergify]

update

✅ Branch has been successfully updated

[lahabana]

@jakubdyszkiewicz ok to merge?