The share feature adds a hashtag to the URL instead of replacing it

[fniessink]

Describe the bug
The share feature adds a hashtag to the URL instead of replacing it. If the user navigates to a shared link and shares another link, it has two hashtags.

To Reproduce
Steps to reproduce the behaviour:

1. Go the a Share tab
2. Copy the link
3. Open the link in another tab and go to a Share tab
4. See that the link has two hashtags.

Expected behaviour
The code that adds the hashtag should strip existing hashtags first.

Additional context

Replace:

const metricUrl = `${window.location}#${metric_uuid}`

With something like:

const metricUrl = `${window.location.split("#")[0]}#${metric_uuid}`