fix: populate self.query for standalone index_control actions

[icaroryan]

Description

Populate self.query for standalone actions defined on self.index_controls.

When an action is defined within an index_control in Avo, and this action is triggered with records selected, the query variable (expected to contain the IDs of the selected records) is empty ([]) when accessed via self.message within the action's execution context. However, the query variable is correctly populated with the selected record IDs if accessed within the def handle method of the same action.

Fixes #3855

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Screenshots & recording

2025-05-16.15-54-32.mov

QA Scenarios

1. Trigger action with no selected records on Index Page => 0 count
2. Trigger action with selected records on Index Page => n counts
3. Trigger action on Show page => 0 count but 1 when executed
4. Trigger action from Has Many Association with/without selections => 0/n count
5. Trigger action on Show page with selections from the Has Many Associations => 0 count but 1 when executed

[qlty-cloud-legacy]

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[Paul-Bob]

LGTM!

Thank you @icaroryan for this contribution!