Add Unit Tests for BlobRemoveAction Class

[kerbymart]

The actions package classes, specifically the BlobRemoveAction class, currently lack unit tests.

Here's a brief outline of what the tests for BlobRemoveAction could cover:

1. Instantiation: Test that the BlobRemoveAction class can be instantiated correctly, and that all initial values are set as expected.

2. Method functionality: For each method in the BlobRemoveAction class, write tests that confirm the method works as expected under normal conditions.

3. Edge cases: Consider edge cases and write tests for them. For example, what happens if we pass null or unexpected values to the methods?

4. Error handling: Test that the class handles errors gracefully and as expected.