fix(explorer): direct rounds not displayed correctly

[hussedev]

Fixes: https://github.com/gitcoinco/grants-stack/issues/3535

Description

• (explorer) src/features/api/utils.ts
  • included allov2.DirectGrantsSimpleStrategy in isDirectRound() check function
• (explorer) src/features/round/ApplicationsCountdownBanner.tsx
  • ApplicationsCountdownBanner now handles direct rounds without application period end date, displaying the message Applications are open
• (explorer) src/features/round/ViewRoundPage.tsx
  • Donation time period now is not rendered in direct rounds

Checklist

This PR:

• [ ] Does it add new payout or donation token? In this case, have they been added to the indexer to avoid it to crash?
• [ ] Includes only changes relevant to the original ticket. Significant refactoring needs to be separated.
• [ ] Doesn't disable eslint rules.
• [ ] Doesn't work around the type checker (including but not limited to: type casts, non-null assertions, @ts-ignore, unjustified optional values).
• [ ] Doesn't contain commented out code.
• [ ] If adding/updating a feature, it adds/updates its test script on Notion.

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