Add ability to reset own password

[dominik-zeglen]

I want to merge this change because it resolves #283

Screenshots

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #289 into master will increase coverage by <.01%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   74.36%   74.37%   +<.01%     
==========================================
  Files         606      607       +1     
  Lines        6644     6650       +6     
  Branches     1072     1073       +1     
==========================================
+ Hits         4941     4946       +5     
- Misses       1516     1517       +1     
  Partials      187      187

Impacted Files	Coverage Δ
src/staff/urls.ts	85.71% <ø> (ø)	⬆️
src/storybook/stories/staff/StaffDetailsPage.tsx	50% <0%> (-4.55%)	⬇️
...c/staff/components/StaffPassword/StaffPassword.tsx	100% <100%> (ø)
...f/components/StaffDetailsPage/StaffDetailsPage.tsx	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c151961...44bb4be. Read the comment docs.

[maarcingebala]

@dominik-zeglen Please fix the copy-pasted modal title 👀. Also - there are 174 files changed which makes it impossible to review. Please update the PR to only include changes related to this feature. If there are any code-style changes related to Eslint, we should do them in a separate PR.

[netlify]

Deploy preview for saleor-dashboard-stage processing.

Building with commit 44bb4be

https://app.netlify.com/sites/saleor-dashboard-stage/deploys/5de7c02f945adc000820c336

[tomaszszymanski129]

Two small things