chore(classy): Unify on_run_level hooks

[ieQu1]

Update classy version. The changes include the ability to automatically reverse the order of run_level hook execution, so hi/low hooks are no longer needed.

[coveralls]

Coverage Report for CI Build 1136

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Coverage: 55.565%

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Coverage Stats

Relevant Lines:	2453
Covered Lines:	1363
Line Coverage:	55.56%
Coverage Strength:	10937.05 hits per line

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[Copilot]

Pull request overview

This PR updates MRIA’s integration with classy run-level hooks by moving from separate “high/low” callbacks to a unified on_run_level/2 hook (paired with a classy dependency bump), and adds a simple readiness signal that CT fixtures can wait on.

Changes:

• Bump classy dependency to 0.1.9 and switch MRIA to a single on_run_level/2 callback.
• Add mria_app:ready/0 backed by an optvar flag set/unset on relevant run-level transitions.
• Update the join test fixture to wait for both peer membership and MRIA readiness after joining.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/mria_join_fixture.erl	Adds post-join retries to wait for peer visibility and MRIA readiness.
src/mria_app.erl	Unifies run-level hooks into on_run_level/2 and introduces ready/0 readiness flag.
rebar.config	Updates classy dependency version to support unified run-level hook API.

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