[KOGITO-2916] CLI auto-completion for fish shell

[Kevin-Mok]

See: https://issues.redhat.com/browse/KOGITO-2916

After running kogito completion fish > ~/.config/fish/completions/kogito.fish, the auto-completion for fish works and looks like such:

I also updated the long description for kogito completion --help to match Cobra's latest long description.

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[codecov]

Codecov Report

Merging #480 into master will decrease coverage by 1.71%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master     #480      +/-   ##
==========================================
- Coverage   43.77%   42.06%   -1.72%     
==========================================
  Files         144      169      +25     
  Lines        8692     9036     +344     
==========================================
- Hits         3805     3801       -4     
- Misses       4462     4821     +359     
+ Partials      425      414      -11     

Flag	Coverage Δ
#cli	54.97% <36.70%> (-13.12%)	⬇️
#operator	38.65% <81.25%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/kogito/command/flag/artifact_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/build_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/env_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/gitsource_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/image_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/install_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/kafka_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/operator_flag.go	0.00% <ø> (ø)
cmd/kogito/command/flag/podresource_flag.go	0.00% <0.00%> (ø)
cmd/kogito/command/flag/runtime_flag.go	0.00% <0.00%> (ø)
... and 67 more

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[errantepiphany]

I didn't test every instruction permutation for each shell (bash, zsh, fish) on each os (linux, mac), but it looks like you've covered everything. Your instruction updates are probably "more correct" than what I had in there before, especially for zsh... Next up, powershell? 😜

[Kevin-Mok]

@errantepiphany I just copied the instructions from the Cobra docs. I figured they'd be more up-to-date/accurate, and I might as well update everything if I'm adding in the fish documentation.

Next up, powershell? 😜

That would go against my values. 😛

[ricardozanini]

Looks awesome! Many thanks @Kevin-Mok ;)

[ricardozanini]

@radtriste since you're handling the release, I believe we are ready to start merging 0.14, right? I'll leave this up to you, tho.

[radtriste]

@ricardozanini release branch is already created for the release so anything can be merged safely to master