fix: relays annotation value is readonly and cannot be updated

[niravparikh05]

What does this PR change?

• Borne out of Get Relay Information Back for Cluster Import #140

Does the PR depend on any other PRs or Issues? If yes, please list them.

• No

Checklist

I confirm, that I have...

• Read and followed the contributing guide in CONTRIBUTING.md
• Added tests for this PR
• Formatted the code using go fmt (if applicable)
• Updated documentation on the Paralus docs site (if applicable)
• Updated CHANGELOG.md

[codecov-commenter]

Codecov Report

Merging #227 (e214239) into main (59674a2) will decrease coverage by 0.23%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
- Coverage   34.65%   34.42%   -0.23%     
==========================================
  Files          74       74              
  Lines       11694    11694              
==========================================
- Hits         4052     4026      -26     
- Misses       7093     7123      +30     
+ Partials      549      545       -4     

Impacted Files	Coverage Δ
pkg/service/cluster.go	31.69% <0.00%> (ø)

... and 2 files with indirect coverage changes

[akshay196]

@niravparikh05 Please check my comment on the issue: #140 (comment)

[niravparikh05]

@akshay196 thanks for the review comments, after our discussion have made necessary changes.

[akshay196]

Unlinked #140 issue from this PR.

[akshay196]

Need to update db entries for older clusters to move to new logic in this PR

After upgrading from 0.2.0 to 0.2.5, we had to go into the database for each clusters annotations and change “relay” to “paralus.dev/relay” or else the bootstrap file would have an empty relay value for the relay-agent-config configmap