Allow certain response headers coming from AzurePipelinesCredential to be logged

[ahsonkhan]

These two response headers are useful for the service team to debug and diagnose issues, and hence it is requested that we do log them.

• x-vss-e2eid
• x-msedge-ref

We decided, other than logging them, to also add these header values to the exception message that is thrown, so they are always visible, even with logging disabled.

Given our logged headers are based on an allow list, currently these two headers are REDACTED.

azure-sdk-for-go/sdk/azcore/runtime/policy_logging.go

Lines 37 to 63 in 500650c

	// construct default hash set of allowed headers
	allowedHeaders := map[string]struct{}{
	"accept": {},
	"cache-control": {},
	"connection": {},
	"content-length": {},
	"content-type": {},
	"date": {},
	"etag": {},
	"expires": {},
	"if-match": {},
	"if-modified-since": {},
	"if-none-match": {},
	"if-unmodified-since": {},
	"last-modified": {},
	"ms-cv": {},
	"pragma": {},
	"request-id": {},
	"retry-after": {},
	"server": {},
	"traceparent": {},
	"transfer-encoding": {},
	"user-agent": {},
	"www-authenticate": {},
	"x-ms-request-id": {},
	"x-ms-client-request-id": {},
	"x-ms-return-client-request-id": {},

[ahsonkhan]

See Azure/azure-sdk-for-cpp#6001 for an example change from C++.