Use templ as template enine for dashboard component templates

[kron4eg]

What this PR does / why we need it:
This gives us nice type-safety in HTML template

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?
/kind design

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

NONE

Documentation:

NONE

[kubermatic-bot]

Skipping CI for Draft Pull Request.
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[kubermatic-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kubermatic-bot]

Issues go stale after 90d of inactivity.
After a furter 30 days, they will turn rotten.
Mark the issue as fresh with /remove-lifecycle stale.

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/lifecycle stale