Automate and optimize release note creation

[lykinsbd]

Closes Issue #4519

[lykinsbd]

WIP progressing:

 - [release] Lint release files with markdownlint-cli2
markdownlint-cli2 v0.14.0 (markdownlint v0.35.0)
Finding: changelog/*.md !changelog/towncrier_template.md CHANGELOG.md docs/docs/release-notes/infrahub/*.{md,mdx}
Linting: 23 file(s)
Summary: 0 error(s)
 - [release] Lint release files with vale
✔ 0 errors, 0 warnings and 0 suggestions in 23 files.
 - [release] Verify Towncrier render possible
Loading template...
Finding news fragments...
Rendering news fragments...
Draft only -- nothing has been written.
What is seen below is what would be written.

## [Infrahub - v0.16.2](https://github.com/opsmill/infrahub/tree/infrahub-v0.16.2) - 2024-10-07


### Added

- Adding `invoke` tasks to assist with release process. ([#4519](https://github.com/opsmill/infrahub/issues/4519))
- Added custom Towncrier template to remove extra space after new Changelog entries.

### Fixed

- Save a diff in smaller pieces instead of all at once to prevent out-of-memory error. ([#4511](https://github.com/opsmill/infrahub/issues/4511))
- Editing old `CHANGELOG.md` entries to use uniform formatting from new Towncrier template.
- Fixes exception handling section in the Python SDK batch guide.