chore: added sql migration

[Shivam-nagar23]

Description

Fixes #

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR requires documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested it for all user roles.
• I have added all the required unit/api test cases.

Does this PR introduce a user-facing change?

Summary by Bito

• Added 'is_runtime_arg' boolean column to 'plugin_step_variable' table to support runtime arguments for plugin variables.
• Added 'value_constraint_id' integer column with foreign key to 'value_constraint' table for value constraints on plugin variables.
• Created up and down SQL migrations to apply and revert the schema changes, noting that these additions were missed in a previous migration.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud