Incorrect error report when manifest.contributors contribution entry does not match enum

[prototaxites]

Bug report

With Nextflow 25.10, if the value of the contribution key in a contributor map in manifest.contributors doesn't match the enum, you get an incorrect error:

Invalid config option `manifest.contributors` -- should be a list of maps

Expected behavior and actual behavior

The error should explain that the value does not match the enum, something like:

Invalid config option `manifest.contributors` -- `contributon` is not a valid key for `contributor`.

Steps to reproduce the problem

git clone git@github.com:nf-core/demo.git && cd demo
sed -i '' "s/'contributor'/'contributon'/" nextflow.config ## macos
sed -i "s/'contributor'/'contributon'/" nextflow.config ## linux

nextflow run . -profile test,docker --outdir results

Program output

Nov-10 17:02:32.744 [main] DEBUG nextflow.cli.Launcher - $> nextflow run . -profile test --outdir results
Nov-10 17:02:32.776 [main] DEBUG nextflow.cli.CmdRun - N E X T F L O W  ~  version 25.10.0
Nov-10 17:02:33.178 [main] DEBUG nextflow.cli.Launcher - Operation aborted
nextflow.exception.AbortOperationException: Invalid config option `manifest.contributors` -- should be a list of maps
	at nextflow.config.Manifest.parseContributors(Manifest.groovy:174)
	at nextflow.config.Manifest.<init>(Manifest.groovy:146)
	at nextflow.scm.AssetManager.getManifest0(AssetManager.groovy:469)
	at nextflow.scm.AssetManager.memoizedMethodPriv$getManifest(AssetManager.groovy:441)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:343)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:328)
	at groovy.lang.MetaClassImpl.doInvokeMethod(MetaClassImpl.java:1339)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1094)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1007)
	at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:645)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:628)
	at org.codehaus.groovy.runtime.InvokerHelper.invokeMethodSafe(InvokerHelper.java:82)
	at nextflow.scm.AssetManager$_closure2.doCall(AssetManager.groovy)
	at nextflow.scm.AssetManager$_closure2.doCall(AssetManager.groovy)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:343)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:328)
	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:280)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1007)
	at groovy.lang.Closure.call(Closure.java:433)
	at org.codehaus.groovy.runtime.memoize.Memoize$MemoizeFunction.lambda$call$0(Memoize.java:137)
	at org.codehaus.groovy.runtime.memoize.ConcurrentCommonCache.getAndPut(ConcurrentCommonCache.java:137)
	at org.codehaus.groovy.runtime.memoize.ConcurrentCommonCache.getAndPut(ConcurrentCommonCache.java:113)
	at org.codehaus.groovy.runtime.memoize.Memoize$MemoizeFunction.call(Memoize.java:136)
	at groovy.lang.Closure.call(Closure.java:412)
	at nextflow.scm.AssetManager.getManifest(AssetManager.groovy)
	at nextflow.scm.AssetManager.getMainScriptName(AssetManager.groovy:415)
	at nextflow.scm.AssetManager.getMainScriptFile(AssetManager.groovy:406)
	at nextflow.scm.AssetManager.getMainScriptFile(AssetManager.groovy)
	at nextflow.cli.CmdRun.getScriptFile0(CmdRun.groovy:620)
	at nextflow.cli.CmdRun.getScriptFile(CmdRun.groovy:573)
	at nextflow.cli.CmdRun.run(CmdRun.groovy:327)
	at nextflow.cli.Launcher.run(Launcher.groovy:515)
	at nextflow.cli.Launcher.main(Launcher.groovy:675)

Environment

• Nextflow version: 25.10
• Java version: openjdk 23.0.2 2025-01-21
• Operating system: macOS and Linux
• Bash version: (use the command $SHELL --version)

Additional context

(Add any other context about the problem here)