HADOOP-19824: Could not find resource '${repo.root}

[ajfabbri]

• Remove directory-maven-plugin used to compute repo.root.
• Replace uses of that variable with ../ or ../../ according to
  directory structure.
• formatting: Strip trailing whitespace on save.

Description of PR

Fixes running spotbugs with maven -pl , e.g.
mvn -pl hadoop-tools/hadoop-aws spotbugs:spotbugs

How was this patch tested?

mvnd clean
mvnd clean compile -pl hadoop-tools/hadoop-aws -am
mvnd -pl hadoop-tools/hadoop-aws -am  spotbugs:spotbugs

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• [na] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

AI Tooling

If an AI tool was used:

• [na] The PR includes the phrase "Contains content generated by "
  where is the name of the AI tool used.
• [na] My use of AI contributions follows the ASF legal policy
  https://www.apache.org/legal/generative-tooling.html