fix: Correct conditions for triggering name lookup during send

[FrederikBolding]

Take changes from 5e08c06

Description

Hotfixes a problem preventing certain name resolution Snaps from being triggered due to faulty IS_FLASK conditions in 12.4.1. These conditions were removed in #26242. This PR picks these changes from the previously mentioned PR, without touching the ENS integration.

The problem in question occurs when trying to trigger name resolution for a given input. lookupDomainName is never called on stable unless the input looks similar to an ENS name. This prevents resolution of inputs that don't use TLDs for instance.

Manual testing steps

1. Use a build of stable
2. Install https://snaps.metamask.io/snap/npm/social-names-snap/
3. See that you can resolve a Farcaster name using that Snap, e.g. fc:frederik
4. Check that you can also type a valid ENS name
5. Check that you can also type a valid address

[Mrtenz]

Suggested change

	* Determines if a string is a possible ethereum address
	*
	* @param candidate - the input to check
	* @returns true if the input is a 40 char hex string with optional 0x prefix, false otherwise
	* Determine if a string is a possible Ethereum address.
	*
	* @param candidate - The input to check.
	* @returns `true` if the input is a 40-character-long hex string with optional 0x-prefix, `false` otherwise.

[FrederikBolding]

This is picked directly from develop. I don't think it makes sense to improve it much in master 😄

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [0c9f4e8]

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Page Load Metrics (1838 ± 89 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	361	2268	1760	370	178
		domContentLoaded	1588	2199	1818	179	86
		load	1597	2265	1838	186	89
		domInteractive	14	65	37	14	7