feat(dev): add release-info command

[bshaffer]

Command to display information about a released tag:

$ ./google-cloud release-info v0.208.0 
+--------------------------+--------------------------------+---------+
| component                | id                             | version |
+--------------------------+--------------------------------+---------+
| BillingBudgets           | cloud-billing-budgets          | 1.2.0   |
| Build                    | cloud-build                    | 0.7.2   |
| Container                | cloud-container                | 1.15.0  |
| Debugger                 | cloud-debugger                 | 1.5.1   |
| Deploy                   | cloud-deploy                   | 0.8.0   |
| DiscoveryEngine          | cloud-discoveryengine          | 0.3.0   |
| PubSub                   | cloud-pubsub                   | 1.43.1  |
| RapidMigrationAssessment | cloud-rapidmigrationassessment | 0.1.0   |
| Spanner                  | cloud-spanner                  | 1.61.0  |
+--------------------------+--------------------------------+---------+

The --format=json option can be used to parse the output from another script:

$ ./google-cloud release-info v0.208.0 --format=json
{
    "version": "v0.208.0",
    "releases": [
        {
            "component": "BillingBudgets",
            "id": "cloud-billing-budgets",
            "version": "1.2.0"
        },
        {
            "component": "Build",
            "id": "cloud-build",
            "version": "0.7.2"
        },
        {
            "component": "Container",
            "id": "cloud-container",
            "version": "1.15.0"
        },
        {
            "component": "Debugger",
            "id": "cloud-debugger",
            "version": "1.5.1"
        },
        {
            "component": "Deploy",
            "id": "cloud-deploy",
            "version": "0.8.0"
        },
        {
            "component": "DiscoveryEngine",
            "id": "cloud-discoveryengine",
            "version": "0.3.0"
        },
        {
            "component": "PubSub",
            "id": "cloud-pubsub",
            "version": "1.43.1"
        },
        {
            "component": "RapidMigrationAssessment",
            "id": "cloud-rapidmigrationassessment",
            "version": "0.1.0"
        },
        {
            "component": "Spanner",
            "id": "cloud-spanner",
            "version": "1.61.0"
        }
    ]
}

[bshaffer]

This is just cleaning up / simplifying these tests, as we can just create the CommandTester directly when we don't need to test things like Question Helpers (e.g. $this->getHelper('question'))

TLDR: it's cleanup that is unrelated to the release-info command

[bshaffer]

same here

[saranshdhingra]

Minor nit. LGTM