fix: argocd cluster add <context> --in-cluster

[kshamajain99]

fixes #6233

We set bearer token if either of certData and KeyData is missing, even if --in-cluster option is provided.

argo-cd/cmd/util/cluster.go

Lines 96 to 98 in cc4eea0

	if len(tlsClientConfig.CertData) == 0 || len(tlsClientConfig.KeyData) == 0 {
	clst.Config.BearerToken = managerBearerToken
	}

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
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[codecov]

Codecov Report

Merging #6276 (9f191cd) into master (cc4eea0) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #6276      +/-   ##
==========================================
- Coverage   41.10%   41.06%   -0.05%     
==========================================
  Files         151      151              
  Lines       19930    19936       +6     
==========================================
- Hits         8192     8186       -6     
- Misses      10610    10622      +12     
  Partials     1128     1128              

Impacted Files	Coverage Δ
pkg/apis/application/v1alpha1/types.go	58.07% <0.00%> (-0.64%)	⬇️
server/server.go	54.87% <0.00%> (-0.73%)	⬇️
controller/appcontroller.go	53.05% <0.00%> (-0.10%)	⬇️
server/application/application.go	30.88% <0.00%> (-0.04%)	⬇️
util/settings/settings.go	46.75% <0.00%> (ø)
util/session/sessionmanager.go	70.11% <0.00%> (ø)

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[alexmt]

LGTM. Thank you!