feat: Add Redis SSL support. Fixes #4688

[eyusupov]

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This is similar to #4689, but adds more options to support various scenarios menitioned in the original PR:

1. insecure tls:
   --redis argocd-redis:6379 --redis-use-tls --redis-insecure-skip-tls-verify

2. self-signed cert on redis server
   --redis argocd-redis:6379 --redis-use-tls --redis-ca-certificate /home/argocd/redis-tls/tls.crt --redis-client-certificate /home/argocd/redis-client-tls/tls.crt --redis-client-key /home/argocd/redis-client-tls/tls.key

3. private ca:
   --redis argocd-redis:6379 --redis-use-tls --redis-ca-certificate /home/argocd/ca/tls.crt --redis-client-certificate /home/argocd/redis-client-tls/tls.crt --redis-client-key /home/argocd/redis-client-tls/tls.key

4. system ca:
   --redis argocd-redis:6379 --redis-use-tls --redis-client-certificate /home/argocd/redis-client-tls/tls.crt --redis-client-key /home/argocd/redis-client-tls/tls.key

Looking into updating tests and the docs

[codecov]

Codecov Report

Merging #6742 (f0c3145) into master (30d2ba1) will decrease coverage by 0.39%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##           master    #6742      +/-   ##
==========================================
- Coverage   41.30%   40.90%   -0.40%     
==========================================
  Files         156      157       +1     
  Lines       20702    20957     +255     
==========================================
+ Hits         8550     8573      +23     
- Misses      10944    11170     +226     
- Partials     1208     1214       +6     

Impacted Files	Coverage Δ
util/cache/cache.go	56.96% <37.50%> (-13.26%)	⬇️
server/server.go	53.90% <0.00%> (-1.06%)	⬇️
util/db/cluster.go	59.52% <0.00%> (-0.48%)	⬇️
util/helm/cmd.go	29.87% <0.00%> (-0.37%)	⬇️
server/cluster/cluster.go	17.54% <0.00%> (-0.32%)	⬇️
pkg/apis/application/v1alpha1/types.go	57.71% <0.00%> (-0.18%)	⬇️
controller/cache/cache.go	10.62% <0.00%> (-0.12%)	⬇️
cmd/argocd/commands/login.go	2.31% <0.00%> (-0.12%)	⬇️
cmd/argocd/commands/root.go	2.08% <0.00%> (-0.10%)	⬇️
util/kube/portforwarder.go	0.00% <0.00%> (ø)
... and 6 more

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[alexmt]

Thank you @eyusupov ! Added minor comment about linter errors.

Additionally can you add keys for new redis commands to argocd-cmd-params-cm ConfigMap

argo-cd/docs/operator-manual/argocd-cmd-params-cm.yaml

Line 18 in d7a8a87

redis.db:

[alexmt]

Please fix linter error. The following command should do it:

goimports -local github.com/argoproj/argo-cd -w util/cache/cache.go

[alexmt]

To save time reformatted the file and pushed it to your fork.