Install only optional requirements for release testing

[DanSava]

Issue We would like to only install the optional requirements from ert and not the package when testing against a release this will test what is already installed in the release without modifying the current environment:

Resolves https://github.com/equinor/komodo-releases/issues/5305

Approach

• Extract optional dependencies from pyproject.toml
• Install the extracted dependencies using pip
• Check package versions are not modified by installing the optional(testing) dependencies

(Screenshot of new behavior in GUI if applicable)

• [ ] PR title captures the intent of the changes, and is fitting for release notes.
• [ ] Added appropriate release note label
• [ ] Commit history is consistent and clean, in line with the contribution guidelines.
• [ ] Make sure tests pass locally (after every commit!)

When applicable

• [ ] When there are user facing changes: Updated documentation
• [ ] New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• [ ] Large PR: Prepare changes in small commits for more convenient review
• [ ] Bug fix: Add regression test for the bug
• [ ] Bug fix: Create Backport PR to latest release