fix(eslint-plugin): [no-useless-template-literals] report Infinity & NaN

[StyleShit]

Closes #8294

[typescript-eslint]

Thanks for the PR, @StyleShit!

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[JoshuaKGoldberg]

LGTM, thanks for the quick + straightforward fix! 🧹 ✨

A couple of small thoughts, nothing blocking. Adding 1 approval and setting a reminder to get to this before our next release.

[JoshuaKGoldberg]

[Style] Nit: both of these functions check expression.type === AST_NODE_TYPES.Identifier. I think it'd be just a bit cleaner code to avoid the duplicate check and instead have a single function for both. WDYT?

This is a super nitpicky nit and definitely not a blocker 😄.

A good potential followup might be to look into writing a general catch-all function for this. Searching expression.type === AST_NODE_TYPES.Identifier shows a few dozen results. Maybe half or more of them or so are similar calls.

[StyleShit]

Yeah, so I basically took inspiration from this:

typescript-eslint/packages/eslint-plugin/src/rules/no-inferrable-types.ts

Lines 73 to 80 in 8622286

	function isIdentifier(
	init: TSESTree.Expression,
	...names: string[]
	): boolean {
	return (
	init.type === AST_NODE_TYPES.Identifier && names.includes(init.name)
	);
	}

And thought about extracting it to a util, WDYT?

[JoshuaKGoldberg]

Probably useful to have that as a util yeah. I'm not super picky here to be honest.

[JoshuaKGoldberg]