[Fleet] Add latest package flag and remove force flag

[Zacqary]

Summary

Closes #97138

Preconfiguration can now install a latest version of a package with the latest keyword:

xpack.fleet.packages:
  - name: package_name
    version: latest

This also removes the force flag for installing outdated versions of packages. Instead, if you specify a particular package version, that version will always be installed unless a later version of the package is already installed.

Testing

1. Set your kibana.dev.yml to:

xpack.fleet.packages:
  - name: nginx
    version: latest
  - name: apache
    version: 0.3.4

Ensure that the latest version of nginx is installed, and that version 0.3.4 of apache is installed.

2. Go to Apache > Settings and click the Update Package button. Then refresh the page so that plugin setup runs again. Ensure that the latest version of apache is still installed, and that version 0.3.4 has not been reinstalled.
3. Install Azure. Then modify your kibana.dev.yml to read:

xpack.fleet.packages:
  - name: nginx
    version: latest
  - name: apache
    version: 0.3.4
  - name: azure
    version: 0.2.0

Wait for the server to restart, and refresh the page. Ensure that the latest version of Azure remains installed, and that 0.2.0 has not been forced to install.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[elasticmachine]

Pinging @elastic/fleet (Feature:Fleet)

[jen-huang]

Code changes look good but I'm not sure that latest is working as expected if an older package version is already installed. I did a local test like this:

• Start kibana with yaml

xpack.fleet.packages:
  - name: nginx
    version: latest
  - name: apache
    version: 0.3.4

• Verified that nginx latest and apache 0.3.4 are installed
• Updated kibana yaml to

xpack.fleet.packages:
  - name: nginx
    version: latest
  - name: apache
    version: latest

• Observed that apache 0.3.4 is still installed, instead of being upgraded to the latest version. UI shows that an upgrade is available

[Zacqary]

@jen-huang Updated the ensureInstalledPackage function to behave as expected.

[jen-huang]

Tested again locally by specifying apache 0.3.4 -> latest -> back to 0.3.4. Confirmed that the behavior is correct now and the latest version remains installed even when specifying an older version. 🚀

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: b323bbb
• Storybooks Preview

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
fleet	345.8KB	346.2KB	+317.0B

History

• 💚 Build #120074 succeeded a6d4beb

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @Zacqary