Fix cache cypress hashfile path

[jowg-amazon]

Description

CI is failing on Cache Cypress step.

Error: The template is not valid. .github/workflows/dashboards-notifications-test-and-build-workflow.yml (Line: 173, Col: 16): hashFiles('**/package.json') couldn't finish within 120 seconds.

This PR adjusts the name of the hashfile so it's consistent with main

OpenSearch-Dashboards/plugins/dashboards-notifications/package.json

Issues Resolved

[List any issues this PR will resolve]

Check List

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (2649dfa) to head (d8ddb5a).
Report is 9 commits behind head on 2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x     #280      +/-   ##
==========================================
- Coverage   82.63%   82.33%   -0.30%     
==========================================
  Files          55       55              
  Lines        1687     1721      +34     
  Branches      456      462       +6     
==========================================
+ Hits         1394     1417      +23     
- Misses        286      297      +11     
  Partials        7        7              

Flag	Coverage Δ
dashboards-notifications	82.33% <ø> (-0.30%)	⬇️

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