feat: Auth refactoring to support single version token

[sarabala1979]

Checklist:

• [ x] Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• [ x] The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234". Refactoring Auth implementation to support single token format #1997
• [x ] I have written unit and/or e2e tests for my change. PRs without these are unlike to be merged.
• Optional. I've added My organization is added to the README.
• I've signed the CLA and required builds are green.

[codecov]

Codecov Report

Merging #1998 into master will increase coverage by 0.02%.
The diff coverage is 36.76%.

@@            Coverage Diff            @@
##           master   #1998      +/-   ##
=========================================
+ Coverage    8.86%   8.88%   +0.02%     
=========================================
  Files          52      52              
  Lines       33562   33585      +23     
=========================================
+ Hits         2974    2985      +11     
- Misses      30195   30205      +10     
- Partials      393     395       +2

Impacted Files	Coverage Δ
pkg/apis/workflow/v1alpha1/workflow_types.go	7.23% <ø> (ø)	⬆️
.../apis/workflow/v1alpha1/workflow_template_types.go	46.15% <ø> (ø)	⬆️
pkg/apis/workflow/v1alpha1/openapi_generated.go	0% <0%> (ø)	⬆️
workflow/util/util.go	16.04% <0%> (ø)	⬆️
...kg/apis/workflow/v1alpha1/zz_generated.deepcopy.go	0% <0%> (ø)	⬆️
util/kubeconfig/kubeconfig.go	10.71% <0%> (ø)	⬆️
pkg/apis/workflow/v1alpha1/generated.pb.go	0.45% <0%> (ø)	⬆️
workflow/controller/operator.go	57.54% <100%> (ø)	⬆️
workflow/ttlcontroller/ttlcontroller.go	32.35% <100%> (ø)	⬆️
workflow/controller/controller.go	0.71% <40%> (+0.71%)	⬆️
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update de02a42...93dbb00. Read the comment docs.

[alexec]

Conditional approval - can you look at my comments please? Otherwise - great stuff!