Remove lfmerge from LF app container

[rmunn]

Description

Now that lfmerge is running in a separate container, we can remove the lfmerge package (and all its dependencies) from the LF app container, reducing the size of the app container.

This is a continuation of #1315.

Type of Change

Only keep lines below that describe this change, then delete the rest.

• New feature (non-breaking change which adds functionality)

Testing on your branch

Please describe how to test and/or verify your changes. Provide instructions so we can reproduce. Please also provide relevant test data as necessary. These instructions will be used for QA testing below.

• Load Language Forge and create a new project from Language Depot
• Edit the project in Language Forge (add an entry, modify a couple of entries) and do another Send/Receive
• Send/Receive that same project in FieldWorks to ensure that the changes really did come through

Checklist

• I have performed a self-review of my own code
• I have reviewed the title/description of this PR which will be used as the squashed PR commit message
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works

qa.languageforge.org testing

Reviewers: add/replace your name below and check the box to sign-off/attest the feature works as expected on qa.languageforge.org

• Reviewer1 (YYYY-MM-DD HH:MM)
• Reviewer2 (YYYY-MM-DD HH:MM)

[github-actions]

Unit Test Results

    1 files      1 suites   11s ⏱️
373 tests 373 ✔️ 0 💤 0 ❌

Results for commit df39e19.

[longrunningprocess]

This looks like excellent work! I've just looked over the code and not pulled it local to test but I trust you have.