[DEV-9941] Renamed source package dataclass_descriptors -> boilerplate in prep for boilerplate changes (test remains unchanged)

[charlta]

Description

Simple rename of a package in an upcoming PR to remove noise for that PR.

Associated tasks

• Dev 9850 remove list boilerplate #240

Test Steps

None, just run unit tests.

Checklist

If any of these are not applicable, strikethrough the line ~like this~. Do not delete it!. Let the reviewer decide if you should have done it.

Code

• I have performed a self review of my own code (including checking issues raised when creating the PR).
• I have added/updated unit tests for these changes, and if not I have explained why they are not necessary.
  - [ ] I have commented my code in any hard-to-understand or hacky areas.
  - [ ] I have handled all new warnings generated by the compiler or IDE.
• I have rebased onto the target branch (usually main).

Security

When developing applications, use following guidelines for information security considerations:

• Access to applications should be protected with security keys/tokens or usernames and passwords;
• All sessions are encrypted if possible;
• All application input is sanitised before being acted on (ie SQL statements, etc);
• Log messages, and especially client-facing ones, must be handled securely and must not leak credentials information (internal URLs, passwords, tokens).

• I have considered if this change impacts information security and made sure those impacts are handled.

Documentation

- [ ] I have updated the changelog. Change to unreleased package.
- [ ] I have updated any documentation required for these changes.

Breaking Changes

• I have considered if this is a breaking change and will communicate it with other team members by posting it on the Slack breaking-changes channel.

Breaking, but also unreleased.

[ryanjcoleman]

Task linked: DEV-9941 Boilerplate prep for Python