fix(polling): cancel scheduled timer on error

[romansmirnov]

Description

• Cancel scheduled timer on error

Related issues

closes #8423

Definition of Done

Not all items need to be done depending on the issue and the pull request.

Code changes:

• The changes are backwards compatibility with previous versions
• If it fixes a bug then PRs are created to backport the fix to the last two minor versions. You can trigger a backport by assigning labels (e.g. backport stable/0.25) to the PR, in case that fails you need to create backports manually.

Testing:

• There are unit/integration tests that verify all acceptance criterias of the issue
• New tests are written to ensure backwards compatibility with further versions
• The behavior is tested manually
• The change has been verified by a QA run
• The impact of the changes is verified by a benchmark

Documentation:

• The documentation is updated (e.g. BPMN reference, configuration, examples, get-started guides, etc.)
• New content is added to the release announcement

[lenaschoenburg]

Looks great, thank you! 🏅

[lenaschoenburg]

bors r+

[ghost]

Build succeeded:

• continuous-integration/jenkins/branch

[github-actions]

Successfully created backport PR #8443 for stable/1.1.

[github-actions]

Successfully created backport PR #8444 for stable/1.2.