Only publish jvm jar to maven. Don't need the ios ones.

[nlam-atlassian]

Our publish action is publishing jars for ios platform too. Our artifactory directory looks like:

collab/
collab-iosarm64/
collab-iossimulatorarm64/
collab-iosx64/
collab-jvm/

and inside each directory looks something like:

collab-iossimulatorarm64-1.1.3-metadata.jar
collab-iossimulatorarm64-1.1.3-metadata.jar.asc
collab-iossimulatorarm64-1.1.3-sources.jar
collab-iossimulatorarm64-1.1.3-sources.jar.asc
collab-iossimulatorarm64-1.1.3.klib
collab-iossimulatorarm64-1.1.3.klib.asc
collab-iossimulatorarm64-1.1.3.module
collab-iossimulatorarm64-1.1.3.module.asc
collab-iossimulatorarm64-1.1.3.pom
collab-iossimulatorarm64-1.1.3.pom.asc

I don't think we need the ios verions of this, so I've changed it to only publish the jvm versions.

[tchernykh]

Aren't those needed to build iOS apps for Kotlin Multiplatform projects?

[nlam-atlassian]

@tchernykh I thought iOS only needed the assets in each release? in https://github.com/atlassian-labs/prosemirror-kotlin/releases/tag/1.1.3 or am I confused?

[nlam-atlassian]

Closing this PR since we want to keep all those files/directories