Make manifest optional in application package pdfV2

[sfc-gh-pjafari]

Pre-review checklist

• [x] I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• [x] I've added or updated automated unit tests to verify correctness of my new code.
• [ ] I've added or updated integration tests to verify correctness of my new code.
• [x] I've confirmed that my changes are working by executing CLI's commands manually on MacOS.
• [ ] I've confirmed that my changes are working by executing CLI's commands manually on Windows.
• [x] I've confirmed that my changes are up-to-date with the target branch.
• [x] I've described my changes in the release notes.
• [x] I've described my changes in the section below.

Changes description

• make manifest field optional in pdfV2 definition of application package
• don't generate manifest field in v1-to-v2 conversions

Change to snowflake-cli-templates to exclude the field when cli version >= 3.2.0 https://github.com/snowflakedb/snowflake-cli-templates/pull/15