Remove transaction service usage

[iamacook]

What it solves

Resolves #3114

How this PR fixes it

All reference to the /tokens endpoint has been removed: fetchTokens() and all related code was deleted as it was seemingly not used at all.

getDataDecoderUrl()/getMasterCopiesUrl() were modified to rely on the CGW.

How to test it

Master copies

1. Open settings.
2. Check that no error is thrown and that the Safe version is correct in the top left.

Data decoder: create a hex encoded transaction via the Transaction Builder.

1. Create a transaction via the Transaction Builder with hex encoded data.
2. Send the transaction and check that the data decodes correctly.

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	2	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[github-actions]

Deployment links

🟠 Safe Rinkeby	⚪ Safe Mainnet	🟣 Safe Polygon	🟡 Safe BSC	⚫ Safe Arbitrum	🟢 Safe xDai

[coveralls]

Pull Request Test Coverage Report for Build 1615680193

• 3 of 7 (42.86%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.02%) to 32.21%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/utils/decodeTx.ts	2	3	66.67%
src/logic/contracts/api/masterCopies.ts	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/config/index.ts	1	60.2%

Totals
Change from base Build 1614899864:	0.02%
Covered Lines:	3075
Relevant Lines:	8479

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💛 - Coveralls

[github-actions]

E2E Tests Failed
Check the results here: https://github.com/gnosis/safe-react-e2e-tests/actions/runs/1615708700

Failed tests:

• ❌ Safe Apps List Safe Apps List
• ❌ Read-only transaction creation and review Read-only transaction creation and review

[iamacook]

@DiogoSoaress, having this finished is integral to starting #2533. Feel free to take on #2533. getMasterCopiesUrl and the associated retrieval of master copies and getDataDecoderUrl() and the associated interaction need to be migrated to the SDK.

[DiogoSoaress]

Code looks good!

Good job leaving the comments in the txService leftovers

2 small things that you didn't touch but we could clean up:

• When changing safe and we enter the reducer ADD_TOKENS we are not cleaning tokens that the current safe does not have. I.e, the reducer is keeping leftover tokens

• The method containsMethodByHash in src/logic/tokens/store/actions/fetchTokens.ts is not being used anywhere and we can delete it

[DiogoSoaress]

🚀