Mark created Pholio mockups as new objects to fix empty Feed transaction entries
Summary:
When creating a Pholio mockup, `setIsCreateTransaction(true)` to avoid an empty `Transaction` field in the Feed and avoid `strncmp()` complaining about a null value being passed.
This is very similar to T15659 about Differential Diffs.
```
ERROR 8192: strncmp(): Passing null to parameter #1 ($string1) of type string is deprecated at [/var/www/html/phorge/phorge/src/applications/policy/query/PhabricatorPolicyQuery.php:314]
```
Closes T15679
Test Plan:
1. Create a new Pholio mockup via `/pholio/create/`
2. Go to `/feed/transactions/query/all/`
3. Compare entries in the `Transaction` column before (empty ones) and after (no empty ones) applying the patch.
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T15679
Differential Revision: https://we.phorge.it/D25600