RFR: 8356656: Drop unused DEVKIT_HOME from jib-profiles.js

[Erik Joelsson]

On Fri, 9 May 2025 22:39:18 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

> The DEVKIT_HOME environment variable gets set up in jib-profiles.js but the last use of it was removed in [JDK-8264805](https://bugs.openjdk.org/browse/JDK-8264805).
> 
> Testing: tier1,builds-tier[2-5]

Looks like you accidentally added some extra files.

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Changes requested by erikj (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25159#pullrequestreview-2833240186