Deleted Jenkinsfile and fixed Deployment

[PhilippSchmelter]

Closes #546

This pull request includes several changes to the gradle/scripts/mavenCentralPublish.gradle file to improve the Maven publishing process. The key changes involve updating task definitions, modifying property checks, and refining POM details.

Updates to task definitions:

• Changed the task definitions for sourcesJar and javadocJar to use tasks.register instead of the older task creation method.

Property checks and version handling:

• Added a check for the deployVersion property and introduced versionString to handle snapshot and normal versions differently.

POM details and artifact handling:

• Updated the POM description and license URL to reflect the new project details. [1] [2]
• Changed the assignment of groupId, artifactId, and version to use the new versionString and updated artifact references to use tasks.named.

Signing and POM generation:

• Added in-memory PGP key usage for signing and updated the POM file generation task to use the new layout.

[sebastian-peter]

Please also remove printVersion from build.gradle, as it's not used anymore.

Also, please test deployment once at least

[sonarqubegithubprchecks]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• No coverage information (65.80% Estimated after merge)
• No duplication information (0.00% Estimated after merge)

Project ID: edu.ie3:utils

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[sebastian-peter]

Ok thanks, let's give it a try