Active polls cache fix

[hernandoagf]

What does this PR do?

It ensure the partial-active-polls are re-fetched if their cache key is not valid or not found

[vercel]

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Name	Status	Preview	Updated (UTC)
governance-portal-v2	✅ Ready (Inspect)	Visit Preview	Jul 18, 2023 11:12pm

[what-the-diff]

PR Summary

• Improved Error Handling in fetchPolls.ts File
  Previously the code's structure could potentially lead to some errors or unexpected results due to attempting to work with undefined variables. Now these risks have been mitigated by adding a fallback value to partialActivePolls - if it doesn't hold any values, it will be assigned a value of newPartialActivePolls.

• Enhanced Code Flexibility
  The way activePollIds is assigned has been tweaked to make the code more resilient and able to handle more diverse situations. With the introduction of optional chaining, the code can navigate through complex objects and arrays without causing errors if a reference or function is undefined. The nullish coalescing operators offer a more precise way to fallback to a default value when dealing with a possible null or undefined variable.

This will contribute in reducing possible runtime errors and increase the accuracy of poll-fetching function.