Have defaults for branches / tags of Konveyor components based on the branch where CI is running

[pranavgaikwad]

These values should have defaults based on the branch where CI is running in any repo. Right now, all default to main / latest

ci/.github/workflows/global-ci.yml

Lines 6 to 13 in 66bb053

	tag:
	description: |
	The tag that should be used to pull all konveyor related images.
	For example, if you wanted to set a nightly build for release-0.2, you would specify
	"release-0.2".
	required: false
	type: string
	default: latest

ci/.github/workflows/global-ci.yml

Lines 33 to 52 in 66bb053

	api_tests_ref:
	description: |
	The branch or PR of the go-konveyor-tests repository to clone.
	For a pull request, the reference format would be "refs/pull/${PR_NUMBER}/merge".
	For a branch, the reference format would just be the branch name.
	This input can be set automatically on a pull request by adding a string of the format:
	Go tests PR: 140
	replacing "140" with the appropriate PR number. This will make it easier to coordinate changes
	that require updating the global tests as well.
	required: false
	type: string
	default: main
	api_hub_tests_ref:
	description: |
	The branch or PR of the Hub API tests from tackle2-hub repository to clone.
	For a pull request, the reference format would be "refs/pull/${PR_NUMBER}/merge".
	For a branch, the reference format would just be the branch name.
	required: false
	type: string
	default: main

We need to find occurrences elsewhere too.