Unnecessary offences include false positives as well as flagged
errors which have follow up issues in order to be addressed.

Not all issues have been addressed before this being submitted
in the spirit of results and iteration.

- Upgraded core-js from v2.x to v3.1.3
- Updated core-js import statements
- Enabled URL polyfill

It takes a lot of lines to move a script

Signed-off-by: NTakuya Noguchi <takninnovationresearch@gmail.com>

Some dependencies have incompatibilities with Node v12, which will
become LTS in October. Namely node-sass and needed to be forwarded in
order for their native extensions to compile without errors.

- Created scripts/frontend/test.js
- Updated test task to call Node script

pdf.js is available on npm. Importing the dependency from there instead
of vendoring it has certain benefits, e.g. the discoverability of
updates (especially security fixes).

We were using 8.0.0-rc.8 previously, and there appears to be significant
new dependencies.

Implemented the toast component for success messages

Does not run stylelint for the vendors folder

Resolves an issue where long series label names overflow
the popover chart tooltip container

Adding support for metrics alerts disabled multiple query support.
To avoid a data model refactor, this enables the visual of multiple
queries per chart on the front end, combining queries based on
metric group, title, and y-axis label.

This also adds support for adding and editing alerts based on the
query selected rather than the single metric associated with the chart.

Remove unneeded var for webpack-prod call in gitlab-ci

This resolved the one conflict we have in CE/EE.

# Conflicts:
#   package.json

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