fix ism e2e: dismissToast and failOnStatusCode for managed service

[aditi-1601]

Description

[Describe what this change achieves]
Fix ISM E2E Cypress tests. Toast notifications from ISM job interval/jitter updates block UI interactions in managed_indices_spec.js, causing subsequent tests to fail when trying to click elements behind the toast.

###Testing
Ran managed_indices_spec.js locally against OpenSearch 2.17.0 with ISM plugin:

Managed indices
can have policies removed
✓ successfully (21028ms)
can have policies retried
✓ successfully (37008ms)
can edit rollover_alias
✓ successfully (7946ms)
can change policies
✓ successfully (20119ms)
can manage data stream indices
✓ successfully (8832ms)

5 passing (2m)

Issues Resolved

[List any issues this PR will resolve]

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[github-actions]

PR Code Suggestions ✨

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Category	Suggestion	Impact
General	Dismiss all toasts, not just first When multiple toasts are shown simultaneously, only the first close button is clicked, leaving other toasts visible which may cover elements needed by subsequent assertions. Iterate over all matched close buttons to dismiss every toast. cypress/utils/plugins/index-management-dashboards-plugin/commands.js [175-181] Cypress.Commands.add('dismissToast', () => { cy.get('body').then(($body) => { - if ($body.find(`[data-test-subj="toastCloseButton"]`).length) { - cy.get(`[data-test-subj="toastCloseButton"]`).click({ force: true }); + const closeButtons = $body.find(`[data-test-subj="toastCloseButton"]`); + if (closeButtons.length) { + cy.get(`[data-test-subj="toastCloseButton"]`).each(($el) => { + cy.wrap($el).click({ force: true }); + }); } }); }); Suggestion importance[1-10]: 5 __ Why: Valid improvement: iterating over all matched toast close buttons is more robust when multiple toasts appear simultaneously, though the original single-click approach may often be sufficient in practice.	Low