@azure/identity throw environmental credetials exception on constructor

[AndreaBeggiato]

Packages impacted by this PR

@azure/identity

Issues associated with this PR

Describe the problem that is addressed by this PR

EnviromentalCredential never throws an exception in constructor, but always throw exception in getToken inside a tracingClient.withSpan (https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/identity/identity/src/credentials/environmentCredential.ts#L151-L168)

When using DefaultCredentials the first try to getToken is EnvironmentalCredential and (e.g in a Managed identity environment) this will throw an exception that will be recorded in the tracing. Our trace is full of errors because of that (see attachment)

What are the possible designs available to address the problem? If there are more than one possible design, why was the one in this PR chosen?

Suggested approach will fix the issue, but a better approach IMHO should be to add an isAvailable method to TokenCredential interface and in DefaultAzureCredentials constructor (https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/identity/identity/src/credentials/defaultAzureCredential.ts#L235-L262) use this new method to conditionally add the credentials to ChainedTokenCredential constructor.

The issue exists also in the other ChainedTokenCredential subclasses

Are there test cases added in this PR? (If not, why?)

• Yes

Command used to generate this PR:**(Applicable only to SDK release request PRs)

Checklists

• [ X] Added impacted package name to the issue description
• Does this PR needs any fixes in the SDK Generator?** (If so, create an Issue in the Autorest/typescript repository and link it here)
• Added a changelog (if necessary)

[github-actions]

Thank you for your contribution @AndreaBeggiato! We will review the pull request and get back to you soon.

[AndreaBeggiato]

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[azure-sdk]

API change check

API changes are not detected in this pull request.

[KarishmaGhiya]

Suggested change

	throw new CredentialUnavailableError(
	if(!this._credential)
	throw new CredentialUnavailableError(

[KarishmaGhiya]

Suggested change

return;

[KarishmaGhiya]

We are discussing this design internally, so we'll hold off making this change for now.

[AndreaBeggiato]

There are a lot of other place where the same pattern is followed (expecting an exception inside a tracer.withSpan on purpose)

e.g. https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/storage/storage-blob/src/ContainerClient.ts#L768-L795