Hotfix - Improve allowance check on Gnosis Chain

[timjrobinson]

Description

• Refetch allowances before running the isApprovalValid action as sometimes it won't pick up the newly approved allowance (especially on Gnosis chain).
• Switch Gnosis chain to the official RPC as it seems to be more reliable than pokt.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Join a pool or stake on Gnosis Chain
• Ensure you don't get any errors about not having enough allowance.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

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Name	Status	Preview	Comments	Updated (UTC)
beta-app-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 3, 2023 3:42pm

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