Should not backfill session-name for SSO Token Provider

[skmcgrail]

aws-sdk-go-v2/config/resolve_bearer_token.go

Lines 59 to 67 in 4b5d0dd

	if ssoSession == nil {
	// Fallback to legacy SSO session config parameters, if the
	// sso-session section wasn't used.
	ssoSession = &SSOSession{
	Name: sharedConfig.SSOStartURL,
	SSORegion: sharedConfig.SSORegion,
	SSOStartURL: sharedConfig.SSOStartURL,
	}
	}

[isaiahvita]

specifically, i believe the conditional linked above should be deleted, and an error should be returned if the SSOSession is not set. this is because the SSOTokenProvider is required to rely on a certain format (the existence of the SSOSession). Falling back to a legacy format used by by a different provider (SSOCredentialProvider) should not be supported.

[github-actions]

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