CollectOSS tries to purge celery and redis when collection is disabled

> [!NOTE]
> Migrated from [augurlabs/augur#2299](https://github.com/augurlabs/augur/issues/2299)
> Originally opened by `@ABrain7710` on 2023-04-06

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**Description:**
When augur is run with the `--disable-collection` flag, it still tries to purge redis and celery when shutting down. This causes a connection error since they weren't started

**How to reproduce:**
1. Start augur with `--disable-collection` flag
2. Stop it

**Expected behavior:**
Augur should only try to purge redis and celery when run with collection enabled

**Software versions:**
- Augur: 0.50.1
- OS: macOS