Lookup AWS and Azure integrations by name

[adamconnelly]

Description of the change

• Added support to the AWS and Azure integration data sources for looking up the integrations by name as well as ID.
• Fixed a bug in each data source where the not found error was trying to output the ID, but it was always empty.

Here's an example of using both data sources now:

data "spacelift_aws_integration" "by_id" {
  integration_id = "01G8E6CGYHEW3Y5FIDX4MH7BQP"
}

data "spacelift_aws_integration" "by_name" {
  name = "Test Account"
}

data "spacelift_azure_integration" "by_id" {
  integration_id = "01GA47B959XROE42J4MC3BEBHZ"
}

data "spacelift_azure_integration" "by_name" {
  name = "Test Subscription"
}

Type of change

• [ ] Bug fix (non-breaking change that fixes an issue)
• [x] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation (non-breaking change that adds documentation)

Checklists

Development

• [x] Lint rules pass locally
• [x] The code changed/added as part of this pull request has been covered with tests
• [x] All tests related to the changed code pass in development
• [x] Examples for new resources and data sources have been added
• [x] Default values have been documented in the description (e.g., "Dummy: (Boolean) Blah blah. Defaults to false.)
• [x] If the action fails that checks the documentation: Run go generate to make sure the docs are up to date

Code review

• [x] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• [x] Pull Request is no longer marked as "draft"
• [ ] Reviewers have been assigned
• [x] Changes have been reviewed by at least one other engineer
• [x] The target branch is future unless the change is going directly into production

[marcinwyszynski]

Task linked: CU-2rrfuk0 [AWS Attachments] Allow lookup by integration name