This commit adds a `packs` option to the codeql-config.yml file. Users
can specify a list of ql packs to include in the analysis.

For a single language analysis, the packs property looks like this:

```yaml
packs:
  - pack-scope/pack-name1@1.2.3
  - pack-scope/pack-name2   # no explicit version means download the latest
```

For multi-language analysis, you must key the packs block by lanaguage:

```yaml
packs:
  cpp:
    - pack-scope/pack-name1@1.2.3
    - pack-scope/pack-name2
  java:
    - pack-scope/pack-name3@1.2.3
    - pack-scope/pack-name4
```

This implementation adds a new analysis run (alongside custom and 
builtin runs). The unit tests indicate that the correct commands are
being run, but I have not actually tried this with a real CLI.

Also, convert `instanceof Array` to `Array.isArray` since that is
sightly better in some situations. See:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray#instanceof_vs_isarray

During the analyze phase.

Use strings instead. They are easier to serialize and deserialize.

1. Better malformed data guard for PackDownloadOutput
2. Fix Packs type
3. Remove TODO in init-action

Uses two pre-existing packages to run some simple queries on a javascript
database.

Extract a `runTool` function that captures the stdout and returns it.
A small refactoring that reduces copied code.

Slightly simplifies the `parsePacks` function.

Also, make the baseline count message less awkward sounding.

Cleans up the output logs even more. These entries don't add any more
information since everything is grouped now.

This was causing the workflow to run and create tags after merging
main into a branch.