Convert dump_validators from jest to bash

[lukaw3d]

Instead of abusing jest to call typescript getOasisscanAPIs().getAllValidators() this saves curl response.

(relating to #815 (comment): this would unblock globally mocking fetch in jest)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.01s
✅ BASH	bash-exec	1		0	0.0s
✅ BASH	shellcheck	1		0	0.01s
✅ BASH	shfmt	1	0	0	0.01s
✅ EDITORCONFIG	editorconfig-checker	5		0	0.01s
✅ JSON	eslint-plugin-jsonc	1	0	0	0.8s
✅ JSON	jsonlint	1		0	0.21s
✅ JSON	prettier	1	0	0	0.43s
✅ JSON	v8r	1		0	6.15s
✅ REPOSITORY	checkov	yes		no	12.16s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ TYPESCRIPT	eslint	2	0	0	5.38s
✅ YAML	prettier	1	0	0	0.63s
✅ YAML	v8r	1		0	2.08s
✅ YAML	yamllint	1		0	0.2s

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[codecov]

Codecov Report

Merging #1113 (cd2df49) into master (659c554) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1113      +/-   ##
==========================================
- Coverage   83.68%   83.54%   -0.14%     
==========================================
  Files         121      121              
  Lines        2249     2249              
  Branches      539      539              
==========================================
- Hits         1882     1879       -3     
- Misses        367      370       +3     

Flag	Coverage Δ
cypress	51.80% <0.00%> (ø)
jest	76.70% <100.00%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/app/state/staking/saga.ts	85.36% <100.00%> (ø)
src/app/state/account/saga.ts	83.01% <0.00%> (-5.67%)	⬇️