Fix the e2e test script to make sure all previous servers are killed before starting a new one.

[mojatalks]

Description

Updated the e2e test script to kill any previous server before starting a new test using react native killer.

Tested

Ran the mobile e2e test.

yarn test:dry-run-e2e

Other changes

N/A

Related issues

N/A - No issue was created. This was done during the mobile e2e testing overview as an exercise.

Backwards compatibility

N/A

[codecov]

Codecov Report

Merging #1340 into master will decrease coverage by 7.3%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1340      +/-   ##
==========================================
- Coverage   73.74%   66.43%   -7.31%     
==========================================
  Files         277      264      -13     
  Lines        7420     7744     +324     
  Branches      660      514     -146     
==========================================
- Hits         5472     5145     -327     
- Misses       1836     2497     +661     
+ Partials      112      102      -10

Flag	Coverage Δ
#mobile	66.43% <ø> (-7.31%)	⬇️

Impacted Files	Coverage Δ
packages/mobile/src/account/Analytics.tsx	0% <0%> (-100%)	⬇️
packages/mobile/src/account/Licenses.tsx	0% <0%> (-100%)	⬇️
packages/mobile/src/exchange/actions.ts	28.15% <0%> (-71.85%)	⬇️
packages/mobile/src/import/reducer.ts	37.5% <0%> (-18.06%)	⬇️
packages/mobile/src/firebase/firebase.ts	20.89% <0%> (-15.69%)	⬇️
packages/mobile/src/exchange/reducer.ts	60% <0%> (-15%)	⬇️
packages/mobile/src/alert/reducer.ts	60% <0%> (-12.73%)	⬇️
packages/mobile/src/backup/utils.ts	70.73% <0%> (-12.61%)	⬇️
packages/mobile/src/utils/dynamicLink.ts	64.7% <0%> (-12.22%)	⬇️
packages/mobile/src/networkInfo/reducer.ts	60% <0%> (-11.43%)	⬇️
... and 270 more

---

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 a064908...bc11442. Read the comment docs.

[martinvol]

👍