chore: remove merchant payments feature

[kathaypacific]

Description

Essentially this PR reverts #3376.

I've also removed the translations because I think it is unlikely that we will want to push over the air translations for this feature.

Test plan

n/a

Related issues

• Fixes RET-852

Backwards compatibility

Y

[emerge-tools]

1 build decreased size

Name	Version	Download	Change	Install	Change
Celo (test)	1.69.0 (134)	26.8 MB	⬇️ 123.4 kB (-0.46%)	64.1 MB	⬇️ 229.4 kB (-0.36%)

Celo (test) 1.69.0 (134)

⚖️ Compare build
📦 Install build
⏱️ Analyze build performance

Total install size change: ⬇️ 229.4 kB (-0.36%)
Total download size change: ⬇️ 123.4 kB (-0.46%)

Largest size changes

Item	Install Size Change
main.jsbundle	⬇️ -229.4 kB

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[jeanregisser]

This feels good!! ✂️ 🚀

[codecov]

Codecov Report

Merging #4272 (e837eb5) into main (c0c5436) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4272      +/-   ##
==========================================
+ Coverage   83.84%   83.97%   +0.12%     
==========================================
  Files         710      705       -5     
  Lines       26210    26001     -209     
  Branches     3419     3385      -34     
==========================================
- Hits        21977    21834     -143     
+ Misses       4166     4102      -64     
+ Partials       67       65       -2     

Files	Coverage Δ
src/app/reducers.ts	20.83% <ø> (ø)
src/app/saga.ts	73.12% <ø> (+0.20%)	⬆️
src/app/selectors.ts	94.73% <ø> (-0.10%)	⬇️
src/firebase/firebase.ts	37.56% <ø> (ø)
src/firebase/remoteConfigValuesDefaults.ts	100.00% <ø> (ø)
src/navigator/Screens.tsx	100.00% <ø> (ø)
src/qrcode/utils.ts	79.48% <ø> (+9.38%)	⬆️
src/redux/migrations.ts	98.05% <100.00%> (ø)
src/redux/store.ts	79.36% <ø> (ø)
test/schemas.ts	90.29% <100.00%> (ø)

... and 2 files with indirect coverage changes

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