Bugfix/interval field can be empty

[jovancacvetkovic]

Description

Adds validation for interval field during detector creation workflow.

Issues Resolved

Closes #378

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov-commenter]

Codecov Report

Merging #379 (66ed328) into main (ad62548) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   15.41%   15.39%   -0.02%     
==========================================
  Files         109      109              
  Lines        2887     2890       +3     
  Branches      476      476              
==========================================
  Hits          445      445              
- Misses       2403     2406       +3     
  Partials       39       39              

Impacted Files	Coverage Δ
...nents/DefineDetector/containers/DefineDetector.tsx	2.50% <0.00%> (ø)
...eDetector/components/DetectorSchedule/Interval.tsx	0.00% <0.00%> (ø)

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-379-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 438566030c72a9a47d81d50d0fe1d321389c1954
# Push it to GitHub
git push --set-upstream origin backport/backport-379-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-379-to-2.x.