This is a functionality that never worked perfectly and hasn't been
used for a while.

This allows developers to run the action on their local machine, but
the run was always flaky and never 100% mirrored what was happening on
the actions runner.

This PR ensures environment variables are set before any invocation of
the CLI.  Here is a list of vars that are set:

https://github.com/github/codeql-coreql-team/issues/1124#issuecomment-852463521

This ensures the CLI knows the features and versions of the containing
actions/runner.

Additionally:

- Fix the user agent so that it more closely aligns with user agent
  spec
- Refactor environment variable initialization so that it all happens in
  one place and call.
- Move Mode, getRequiredEnvParam, setMode, getMode out of actions-util
  and into util. actions-util is meant for utils only called by the
  action, not the runner.

The `prepareLocalRunEnvironment()` method is most likely deprecated and
should be removed. I originally added it because I had a way of working
where I would run the action from my local machine to test out changes,
but this was always a little flaky. So, I no longer use this way of
working. I will probably remove it soon.

Hooks are new to commander v8. We can use hooks to ensure that `setMode`
is called before every command is invoked.

Fix the mergeback workflow

The removeNPMAbsolutePaths check requires no newlines at the
end of the file. This ensures that the version update mimics
the behavior.

This should have happened in a mergeback PR, but the workflow to
generate this was broken.

We need to tag and mergeback if the tag does _not_ already exist.

Send version and mode to code scanning via user agent

Update the ql queries to account for change in how we look for runner

Previously, we guarded blocks of code to be run by the runner or the
action using if statements like this:

```js
if (mode === "actions") ...
```

We are no longer doing this. And now, the `unguarded-action-lib.ql`
query is out of date. This query checks that runner code does not
unintentionally access actions-only methods in the libraries.

With these changes, we now ensure that code scanning is happy.

This commit changes the way the action determines if running in action
or runner mode. There is now an environment variable that is set at the
beginning of the process and elsewhere in the process, we can check to
see if the variable is set.

Fix wording in README

Merge main into v1

Minor change.

…stom-queries

Analyze: Log analysis summaries for custom queries

…lease

Add release and mergeback workflows

Ensures that the runner version is bumped along with the action version.

Add Ruby as a possible language

…ersions-upstream-only

Actions: Run enterprise versions workflow only on the parent repo

Merge main into v1

Don't run the cron workflow on forks, since they lack the necessary secrets.

This commit ensures that the changelog is updated before a release with
the correct date and version.

Also, after a release, a mergeback PR is created to ensure that the
changelog update and version bump is available in main.

Use --additional-packs instead of --search-path