Add new MAA test endpoint confinfermaaeus2test

[yf23]

This pull request includes changes to update the JWT issuer URLs and modify the JWT identity provider configurations. The most important changes are summarized below:

JWT Issuer URL Updates:

• Updated the issuer URL in the set_jwt_maa_validation_policy_proposal.json file to https://confinfermaaeus2test.eus2.test.attest.azure.net for both set_jwt_issuer and set_jwt_validation_policy entries. [1] [2]

JWT Identity Provider Enum and Validator Updates:

• Added a new entry MAA_ConfInferenceTestEus2 in the JwtIdentityProviderEnum and commented out the old entries MAA_NoSecureBootWeu and MAA_NoSecureBootEus in JwtIdentityProviderEnum.ts.
• Updated the JwtValidator class to use the new MAA_ConfInferenceTestEus2 identity provider and commented out the old identity provider configurations in JwtValidator.ts.

[beejones]

why are we using microsoft:dev?
we need to remove the JWT issuers from code and only have them in policies.