fixed failed discover app shared links tests

[ruanyl]

1. refactor so that each test case is independent from each other
2. use decodeURI to make url consistent so that the url matches

Description

this PR fixed the 3 failed tests of cypress/integration/core-opensearch-dashboards/opensearch-dashboards/apps/data_explorer/shared_links.spec.js

  shared links
    shared links with state in query
      1) should allow for copying the snapshot URL
      ✓ should allow for copying the snapshot URL as a short URL
      2) should allow for copying the saved object URL
    shared links with state in sessionStorage
      ✓ should allow for copying the snapshot URL (12854ms)
      ✓ should allow for copying the snapshot URL as a short URL
      3) should allow for copying the saved object URL


  3 passing (4m)
  3 failing

  1) shared links
       shared links with state in query
         should allow for copying the snapshot URL:

      Timed out retrying after 60000ms
      + expected - actual

      -'http://localhost:5601/app/data-explorer/discover?security_tenant=global#/?_a=(discover:(columns:!(_source),isDirty:!f,sort:!()),metadata:(indexPattern:\'logstash-*\',view:discover))&_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:\'2015-09-19T04:31:44.000Z\',to:\'2015-09-23T16:31:44.000Z\'))&_q=(filters:!(),query:(language:kuery,query:\'\'))'
      +'http://localhost:5601/app/data-explorer/discover#/?_a=(discover:(columns:!(_source),isDirty:!f,sort:!()),metadata:(indexPattern:\'logstash-*\',view:discover))&_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:\'2015-09-19T13:31:44.000Z\',to:\'2015-09-24T01:31:44.000Z\'))&_q=(filters:!(),query:(language:kuery,query:\'\'))'
      
      at Context.eval (http://localhost:5601/__cypress/tests?p=cypress/integration/core-opensearch-dashboards/opensearch-dashboards/apps/data_explorer/shared_links.spec.js:187:84)

  2) shared links
       shared links with state in query
         should allow for copying the saved object URL:
     AssertionError: Timed out retrying after 60000ms: Expected to find element: `[data-test-subj="savedObjectTitleA-Saved-Search"]`, but never found it.
      at Context.eval (http://localhost:5601/__cypress/tests?p=cypress/integration/core-opensearch-dashboards/opensearch-dashboards/apps/data_explorer/shared_links.spec.js:473:13)

  3) shared links
       shared links with state in sessionStorage
         should allow for copying the saved object URL:
     AssertionError: Timed out retrying after 60000ms: Expected to find element: `[data-test-subj="savedObjectTitleA-Saved-Search"]`, but never found it.
      at Context.eval (http://localhost:5601/__cypress/tests?p=cypress/integration/core-opensearch-dashboards/opensearch-dashboards/apps/data_explorer/shared_links.spec.js:473:13)

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

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[ruanyl]

@abbyhu2000 would be nice if you could take a look :)

[abbyhu2000]

Thanks for improving the tests!

[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-1079-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 3a98fe6bd54d4d35e8f43110fe55c0d57dc1e873
# Push it to GitHub
git push --set-upstream origin backport/backport-1079-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-1079-to-2.x.

[abbyhu2000]

Needs to revert this PR because adding ?security_tenant=global in the URL will make the CI in dashboard fail since we run tests without enabling the security plugins.

Alternatively, we should skip the cypress tests when security is enabled:
#1120