fix: Block joins page if unapproved rate provider

[garethfuller]

Description

See title.

Type of change

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

How should this be tested?

• Test that you cannot access the add-liquidity path if a rate provider is unapproved for a pool.

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

[vercel]

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