[AV-79411] Add a Custom User-Agent HTTP header for Terraform Provider Client

[l0n3star]

Jira

• AV-79411

Description

Use custom user agent in HTTP header so we can identify requests from terraform.

Type of Change

• Bug fix (non-breaking change which fixes an issue). Please, add the "bug" label to the PR.
• New feature (non-breaking change which adds functionality). Please, add the "enhancement" label to the PR.
• Breaking change (fix or feature that would cause existing functionality to not work as expected). Please, add the "breaking change" label to the PR.
• This change requires a documentation update
• Documentation fix/enhancement

Manual Testing Approach

How was this change tested and do you have evidence? (REQUIRED: Select at least 1)

• Manually tested
• Unit tested
• Acceptance tested
• Unable to test / will not test (Please provide comments in section below)

Testing

Tested by retrieving org details from terraform. This uses ExecuteWithRetry.

Validated with tcpdump we get custom user agent:

Transmission Control Protocol, Src Port: 60791, Dst Port: 8084, Seq: 1, Ack: 1, Len: 328
Hypertext Transfer Protocol
    GET /v4/organizations/ffffffff-aaaa-1414-eeee-000000000000 HTTP/1.1\r\n
    Host: localhost:8084\r\n
    User-Agent: terraform-provider-couchbase-capella/1.2.0\r\n
    Authorization: Bearer <token>\r\n
    Accept-Encoding: gzip\r\n

Required Checklist:

• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added tests that prove my fix is effective or that my feature works per HashiCorp requirements
• I have added any necessary documentation (if required)
• I have run make fmt and formatted my code

Further comments

[ajsqr]

LGTM

[a-atri]

looks good to me