[web-server] Add graphql tests

[helfi92]

Describe the bug
Whenever we get new updates from the renovate-bot to bump package versions related to the web-server service, we are not confident 100% that things will still work. We should look into adding some tests to tests graphql queries, mutations, and subscriptions.

[MooseJ]

@helfi92 So I started working on this, but then realized that I'm not 100% what you wanted. Are you looking for tests to be created for every GraphQL query, mutation, and subscription?

[helfi92]

@helfi92 So I started working on this, but then realized that I'm not 100% what you wanted. Are you looking for tests to be created for every GraphQL query, mutation, and subscription?

You have the right idea :) We can start with "Roles" first.

[helfi92]

@MooseJ How do you feel about giving the following a try

taskcluster/services/web-server/src/graphql/Tasks.graphql

Lines 376 to 379 in de2c662

	extend type Subscription {
	# Subscribe to multiple task group subscriptions.
	tasksSubscriptions(taskGroupId: ID!, subscriptions: [TaskSubscriptions]!): TaskStatus
	}

It would be our first subscription test. Once we have a subscription tested, we would be able to merge #2067

[MooseJ]

@helfi92 Yeah I can give that shot!

[helfi92]

Thank you so much!

[helfi92]

@MooseJ Happy new year! How is it going? :-)