Remove Eclipse IDE configuration files from repository

[Copilot]

Removes Eclipse-specific configuration files that should not be version controlled, as they are IDE-specific and auto-generated.

Files removed:

• .settings/ directories (4 directories, 22 files total)
• .classpath files (5 files)
• .project files (4 files)
• .springBeans files (2 files)

Updated .gitignore:
Added patterns to prevent these files from being committed in the future:

# Eclipse-specific files and folders
.settings/
.classpath
.project
.springBeans

This cleanup affects the following modules: treebase-web, treebase-core, treebase-phylowidget, oai-pmh_data_provider, and oai-pmh_data_provider/data_provider_web.

Original prompt

Remove all Eclipse-specific files and folders anywhere in the repo, namely:

• .settings/ (folder plus contents)
• .classpath
• .project
• .springBeans

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