chore: add a note on time frame to PR template

[nytamin]

About the Contributor

This pull request is posted on behalf of the NRK.

Type of Contribution

This is a: Github issue templates improvement

Other Information

This PR adds a couple of form fields to the github templates, as discussed on the NRK team dev meet discussed last week.

Status

• [x] PR is ready to be reviewed.
• [ ] The functionality has been tested by the author.
• [ ] Relevant unit tests has been added / updated.
• [ ] Relevant documentation (code comments, system documentation) has been added / updated.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (d3245d8) 59.07% compared to head (5fd1d44) 59.06%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1148 +/- ## ========================================== - Coverage 59.07% 59.06% -0.01% ========================================== Files 473 473 Lines 71616 71616 Branches 3163 3717 +554 ========================================== - Hits 42309 42303 -6 + Misses 29283 29267 -16 - Partials 24 46 +22 ```

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