Passwordless | ResetPasswordEmailSentPage and API refactors

[coldlink]

What does this change?

• Sets up an ResetPasswordEmailSentPage component that displays the correct page based on whether we're using passcodes or the legacy link method
  • If we're using passcodes, as defined by hasStateHandle variable, then we show the PasscodeEmailSent component
    • If the passcode has already been used, then we show the PasscodeUsed component
  • If we're not using passcodes, then we show the EmailSent component as previously done
• We also move challengeAuthenticatorSchema to shared/schemas.ts as it's also needed by the identifyRemediations type too
• Finally we refactor the validate<ENDPOINT>Remediation methods into a single method called validateRemediation which takes type generics
  • Anything that was previously using the full method definition can just use the types instead, e.g. for validateChallengeAnswerRemediation it becomes

export const validateChallengeAnswerRemediation = validateRemediation<
	ChallengeAnswerResponse,
	ChallengeAnswerRemediationNames
>;

instead of

export const validateChallengeAnswerRemediation = (
	challengeAnswerResponse: ChallengeAnswerResponse,
	remediationName: ChallengeAnswerRemediationNames,
) => {
	const hasRemediation = challengeAnswerResponse.remediation.value.some(
		({ name }) => name === remediationName,
	);

	if (!hasRemediation) {
		throw new OAuthError(
			{
				error: 'invalid_request',
				error_description: `Remediation ${remediationName} not found in challenge/answer response`,
			},
			400,
		);
	}
};

[coldlink]

this is needed as typescript doesn't think that remediationName is a string type that it can put into a template expression even though it is, the tests above prove that: https://github.com/guardian/gateway/pull/2881/files#diff-b996cc3a1711f22fd1ace11e046c019d10b7e7d74ed0c8a2f4caa3750b9d3946R78

[github-actions]

Deploy build 9925 of identity:identity-gateway to CODE

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From guardian/actions-riff-raff.

[akinsola-guardian]

LGTM