Fix legacy redirection of legacy mainnet links

[iamacook]

What it solves

Broken legacy redirection of mainnet.

How this PR fixes it

By loading chains from backend, the config is not immediately present for the redirection logic to reference. The default shortName now corresponds to the default network.

How to test it

1. Attempt to navigate to a legacy route, i.e. {{PR}}/app/#/safes/0xfF501B324DC6d78dC9F983f140B9211c3EdB4dc7/balances
2. Observe the correct redirection to {{PR}}/app/eth:0xfF501B324DC6d78dC9F983f140B9211c3EdB4dc7/balances because the PR has no subdomain from the map.

[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	0	N/A

• Result: ✅ success
• Annotations: 0 total

---

^{Report generated by eslint-plus-action}

[coveralls]

Pull Request Test Coverage Report for Build 1693422458

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.008%) to 32.44%

---

Totals
Change from base Build 1692167562:	-0.008%
Covered Lines:	3123
Relevant Lines:	8571

---

💛 - Coveralls

[github-actions]

Deployment links

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

[github-actions]

E2E Tests Failed
Check the results here: https://github.com/gnosis/safe-react-e2e-tests/actions/runs/1693454065

Failed tests:

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

[katspaugh]

Please remove that as this redirect will be done on the server side.

[katspaugh]

Please put rin and eth into an enum.
AFAIU, we need to hardcode them in this instance because the chains aren't loaded yet.

Or maybe they are already present in the codebase or in the Gateway SDK?

[francovenica]

Question. The only redirection always goes to "rin:". I assume because this is a PR, and in prod, when the URL is something like "https://xdai.gnosis-safe.io/app/#/" it will redirect to the proper xdai: network. Is this correct?

If this is the case then the ticket is good to be merged

[iamacook]

Question. The only redirection always goes to "rin:". I assume because this is a PR, and in prod, when the URL is something like "https://xdai.gnosis-safe.io/app/#/" it will redirect to the proper xdai: network. Is this correct?

Yes, the redirection that already exists on the old subdomains redirects correctly but because of the dynamic loading of configs from the CGW and renaming of Mainnet to Ethereum, it is causing problems with finding the shortName for what was Mainnet. The fallback for this was included as follows so that's why it falls back to Rinkeby on the PR:

DEFAULT_CHAIN_ID === CHAIN_ID.RINKEBY ? SHORT_NAME.RINKEBY : SHORT_NAME.MAINNET

I will merge this now.