feat: support incoming transaction polling only when viewing activity

[matthewwalsh0]

Explanation

Support the clients polling incoming transactions only when viewing the transaction activity list.

Specifically:

• Delete incoming transactions when calling wipeTransactions method.
• Poll immediately when calling startIncomingTransactionPolling method.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes