feat: Refactor CI message generation to use templates

[rhuss]

Updated the triggerCI and createSyncReleasePR functions to utilize text templates for generating CI messages and bodies. This change improves message formatting and error handling when parsing templates. The previous string formatting has been replaced with template execution, enhancing maintainability and readability.

[openshift-ci]

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[cardil]

I like it, but please change the default as well:

deviate/pkg/config/defaults.go

Lines 33 to 37 in 07cc90c

	TriggerCI: ":robot: Synchronize branch `%s` to " +
	"`upstream/%s`",
	TriggerCIBody: "This automated PR is to make sure the " +
	"forked project's `%s` branch (forked upstream's `%s` branch) passes" +
	" a CI.",

[openshift-merge-robot]

PR needs rebase.

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