feat(alerts): Add incident title template support

[baNROne]

Description

https://new-relic.atlassian.net/browse/NR-74510
Note, this PR depends on unmerged changes in newrelic-go-client

Please do not merge yet

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

Please delete options that are not relevant.

• My commit message follows conventional commits
• My code is formatted to Go standards
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes. Go here for instructions on running tests locally.

How to test this change?

• Must be on relevant FF
• Must use this branch of newrelic-client-go
• Incorporate incident_title_template into any newrelic_nrql_alert_condition
• Plan and apply

[akane0915]

Code looks good and manual testing checks out. Can you please update the documentation here to include the new field? https://github.com/newrelic/terraform-provider-newrelic/blob/main/website/docs/r/nrql_alert_condition.html.markdown#L17

[akane0915]

💯