feat(dynamic-sampling): Settings for sample rate

[ArthurKnaus]

Add a form for setting the target sample rate.

https://github.com/user-attachments/assets/fff166c4-924d-4c4a-8cc9-e20a78c0ef62

Closes https://github.com/getsentry/projects/issues/206

[shellmayr]

The demo video shows both a period and a comma as the decimal separator in the input and in the feedback below - can we unify this somehow?

[ArthurKnaus]

The demo video shows both a period and a comma as the decimal separator in the input and in the feedback below - can we unify this somehow?

@shellmayr yes, I noticed that too. Out of whatever reason the native number input insists on using , in chromium based browsers. In Firefox it behaves correctly. Implementing a custom number input based on a text field is quite some effort, so I did not want to do this in this PR. Also I would like to see if it behaves like this for others too as it might be tied to specific language settings.

[shellmayr]

The demo video shows both a period and a comma as the decimal separator in the input and in the feedback below - can we unify this somehow?

@shellmayr yes, I noticed that too. Out of whatever reason the native number input insists on using , in chromium based browsers. In Firefox it behaves correctly. Implementing a custom number input based on a text field is quite some effort, so I did not want to do this in this PR. Also I would like to see if it behaves like this for others too as it might be tied to specific language settings.

Ah ok, gotcha - thanks! I think we should definitely take care of this before launching it widely, but I agree let's see what the conditions are under which this happens so we can make it work thoroughly.

[priscilawebdev]

The 'Switch to Setup' button is overflowing the container on some viewports. Could we look into that?

[ArthurKnaus]

Thx for the detailed reviews! As the whole view is very much a WIP, I collected the non code feedback in a ticket and will revisit it once the rest of the UI is implemented.

[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 62.52kB (0.2%) :arrow_up:. This is within the configured threshold :white_check_mark:

Detailed changes

Bundle name	Size	Change
app-webpack-bundle-array-push	30.97MB	62.52kB (0.2%) :arrow_up:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 86 lines in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...app/views/settings/dynamicSampling/formContext.tsx	0.00%	41 Missing :warning:
...views/settings/dynamicSampling/dynamicSampling.tsx	0.00%	24 Missing :warning:
...settings/dynamicSampling/targetSampleRateField.tsx	0.00%	11 Missing :warning:
...s/settings/dynamicSampling/dynamicSamplingForm.tsx	0.00%	10 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #79341      +/-   ##
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- Coverage   78.34%   78.31%   -0.03%     
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  Files        7123     7136      +13     
  Lines      314824   315162     +338     
  Branches    51460    51506      +46     
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+ Hits       246639   246818     +179     
- Misses      61727    61880     +153     
- Partials     6458     6464       +6