Revert support targetPath property for webResources

[timja]

• Revert "add test for packaging webresources (add test for packaging webresources #213)"
• Revert "support targetPath property for webResources ([JENKINS-64408] support targetPath property for webResources #208)"

Fixes #299

The above change switched the resource path to:

target/solarized-theme

instead of

src/main/webapp

Which prevented live reload of webapp resources which is critical when doing UI development.
(Restarting the hpi:run isn't enough either you had to run a packaging goal too to work around it)

It may be possible to add multiple directories to the resource path but not sure if having both src and target will work.

I tried adding an integration test for this but what I had passed both before and after this change 😢
https://github.com/jenkinsci/maven-hpi-plugin/compare/master...timja:fix-live-reload?expand=1

I've manually tested this and it fixes the issue, full steps are in the issue description (#299)

[daniel-beck]

Could stapler.resourcePath be updated to match?

Nvm, looks like you tried that.

[jglick]

I can cut a release (not sure offhand who else can), so let me know.

[timja]

I can cut a release (not sure offhand who else can), so let me know.

Core team: https://github.com/jenkins-infra/repository-permissions-updater/blob/06c023e956cdc5088fca38d3cb815273d86c3083/permissions/component-maven-hpi-plugin.yml#L8

[timja]

Released https://github.com/jenkinsci/maven-hpi-plugin/releases/tag/maven-hpi-plugin-3.25

[jglick]

⇒ jenkinsci/plugin-pom#509