fix: Install pip and pip-tools in upgrade script

[edx-requirements-bot]

Added pip requirements file and updated the upgrade target script to check the compatibility of upgraded pip and pip-tools versions. For reference, look at this PR for new check added in edx-repo-health.

Additional information from script execution

Python code cleanup by the cleanup-python-code Jenkins job.

This pull request was generated by the cleanup-python-code Jenkins job, which ran

echo "-c constraints.txt
# Core dependencies for installing other packages

pip
setuptools
wheel
" >>  requirements/pip.in;
pip-compile --allow-unsafe --rebuild --upgrade -o requirements/pip.txt requirements/pip.in;

The following packages were installed: pip-tools

JIRA: https://2u-internal.atlassian.net/browse/BOM-3444

[edx-requirements-bot]

Closing obsolete PR.

[feanil]

@Jawayria what's the plan with this PR? Should it be closed?