add shorthand -a for --all flags

[chmouel]

Added shorthand 'a' for the --all flag in various delete commands which has a --all to improve usability and consistency across the CLI and with kubectl.

This change affects the following commands:

• ClusterTriggerBinding delete
• EventListener delete
• Pipeline delete
• PipelineRun delete
• Task delete
• TaskRun delete
• TriggerBinding delete
• TriggerTemplate delete

Changes

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Release Notes

all commands with --all flag now has a a shorthand flag -a

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[chmouel]

/retest

[piyush-garg]

Hey @chmouel

We were following here same like kubectl (1.30)

    --all=false:
	Delete all resources, in the namespace of the specified resource types.

    -A, --all-namespaces=false:
	If present, list the requested object(s) across all namespaces. Namespace in current context is ignored even
	if specified with --namespace.

In my opinion, -a short flag for --all does not help much from UX/usability view, but if @vdemeester @vinamra28 are fine, I am fine to get this in.

[vinamra28]

I agree with @piyush-garg, --all is already short 😅

[chmouel]

sounds good!