fix(pause): ignore step failures inside tryTo and retryTo

[DavertMik]

Fixes #4516. Alternative to #5736.

With -p pause (on=fail), a step that failed inside tryTo or retryTo paused the test even when the test passed.

Instead of switching the trigger to test.failed, the effects now track whether they are active:

• lib/effects.js keeps an activeEffects counter and exports isEffectActive(). tryTo counts for its whole run; retryTo counts only attempts that will be retried, so a failure on the last attempt still pauses. The counter resets on test.before.
• lib/plugin/pause.js ignores step.failed while isEffectActive() is true.

Case	Before	After
step fails inside tryTo	pause	no pause
retryTo passes on a later attempt	pause	no pause
retryTo uses up all attempts	pause	pause
hopeThat soft assertion fails	pause	pause
real failing step / failing Before or After	pause	pause
plain throw without a failed step	no pause	no pause

Tests: test/unit/plugin/pause_test.js (based on the one from #5736) covers these cases.

Known unrelated issue: a step failing inside within inside tryTo gets past tryTo and fails the test; this happens on 4.x without this change.

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