fix(UI): incorrect month showing in MAU

[kevinkarchacryl]

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
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[kevinkarchacryl]

In the analytics MAU chart, the months were displaying as the last day instead of the first day of the next month, confusing users. After this fix, Sep 30 should show up as Oct 1 etc.

[jjoyce0510]

Thanks for the PR. Have you been able to validate this localy? If you can provide any before and after screenshots that wouldb be useful!

[kevinkarchacryl]

Thanks for the PR. Have you been able to validate this localy? If you can provide any before and after screenshots that wouldb be useful!

Here's a screenshot of before. The last tick shows "Sept 30" but is actually for the month of October. The months at the bottom actually show the last day from the previous month if you hover over them.

Here's a screenshot of after. Hovering over the last tick correctly shows "Oct 1". Months on the X-axis are also right.

[jjoyce0510]

Wonderful. Thank you for sharing! I've started full CI. Let's get this in!