Expose --event-log-file to render, apply, and test

[briandealwis]

Fixes #5831 #5833 #5834
Related to: #5125

Description
#5125 added the ability to log events to a file for dev, build, run, debug, deploy. It would be useful to have this available for render, apply, and test.

This PR adds --event-log-file and --enable-rpc for render, apply, and test. It also marks the flag as hidden: it was intended as an internal tool for integration tests:

Follow-up Work (remove if N/A)

• it would be useful to remove the requirement to also run --enable-rpc
• integration tests to ensure that this flag is available as partners may rely on it

[aaron-prindle]

Code change LGTM, I believe doc generation needs to be re-run here - ./hack/generate-man.sh. From travis logs

/hack/man/TestPrintMan
    man_test.go:52: You have skaffold command changes but haven't generated the CLI reference docs. Please run ./hack/generate-man.sh and commit the results!

[briandealwis]

Docs regenerated @aaron-prindle

[codecov]

Codecov Report

Merging #5828 (7407737) into master (35b72aa) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5828      +/-   ##
==========================================
- Coverage   70.99%   70.95%   -0.05%     
==========================================
  Files         440      440              
  Lines       16572    16582      +10     
==========================================
  Hits        11765    11765              
- Misses       3939     3949      +10     
  Partials      868      868              

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/flags.go	89.28% <ø> (ø)
pkg/skaffold/debug/debug.go	32.83% <0.00%> (-5.77%)	⬇️

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[aaron-prindle]

LGTM

[tejal29]

Like we discussed in the standup, please mark the flag hidden.

[briandealwis]

Flag is now hidden.

[nkubala]

LGTM, I restarted the flaked CI job but feel free and merge when green

addressed