refactor: coverage issues when using re2

[RahulGautamSingh]

Describe the proposed change(s).

When we use re2 at these 2 instances, it causes coverage issues.
Instance 1

renovate/lib/util/template/index.ts

Lines 14 to 16 in 04d1612

	handlebars.registerHelper(
	'replace',
	(find, replace, context) => context.replace(new RegExp(find, 'g'), replace) // TODO #12070

Instance 2

renovate/lib/util/template/index.ts

Line 150 in 04d1612

const templateRegex = /{{(#(if|unless) )?([a-zA-Z]+)}}/g; // TODO #12070