Partial revert of 2bea1bee to use System.properties instead of project.properties

Bumps com.gradle:develocity-maven-extension from 1.21 to 1.21.1.

---
updated-dependencies:
- dependency-name: com.gradle:develocity-maven-extension
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

* Finish the move

* Fix doc

* Fix regression

Bumps [com.gradle:common-custom-user-data-maven-extension](https://github.com/gradle/common-custom-user-data-maven-extension) from 1.12.5 to 1.13.
- [Release notes](https://github.com/gradle/common-custom-user-data-maven-extension/releases)
- [Commits](https://github.com/gradle/common-custom-user-data-maven-extension/compare/v1.12.5...v1.13

)

---
updated-dependencies:
- dependency-name: com.gradle:common-custom-user-data-maven-extension
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps com.gradle:gradle-enterprise-maven-extension from 1.20 to 1.20.1.

---
updated-dependencies:
- dependency-name: com.gradle:gradle-enterprise-maven-extension
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

[Misc] Upgrade to try to fix the "Build caching was not enabled for this goal execution because 'argLine.jacoco.append' was set to 'true'." problem with GE caching

Bumps com.gradle:gradle-enterprise-maven-extension from 1.17.3 to 1.19.3.

---
updated-dependencies:
- dependency-name: com.gradle:gradle-enterprise-maven-extension
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [com.gradle:common-custom-user-data-maven-extension](https://github.com/gradle/common-custom-user-data-maven-extension) from 1.12 to 1.12.4.
- [Release notes](https://github.com/gradle/common-custom-user-data-maven-extension/releases)
- [Commits](https://github.com/gradle/common-custom-user-data-maven-extension/compare/v1.12...v1.12.4

)

---
updated-dependencies:
- dependency-name: com.gradle:common-custom-user-data-maven-extension
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

- Replace project.properties by System.getProperties()/System.getProperty()
- Use findAll instead of find to loop over all the properties

* Fix NPE

This reverts commit 3ab593f1.

[Misc] Activate remote caching for platform (same as what's already done for commons and rendering).

* Only push on demand locally (and always on CI)

* Enable local cache except on CI