feat: multi params-file support

[mageshwaran-lifebit]

This pull request updates the handling of multiple parameter files in the CmdRun command. Now, users can specify a comma-separated list of parameter files, and each will be processed in sequence.

Parameter file handling improvements:

• Updated the logic in CmdRun so that if the --params-file option contains multiple files separated by commas, each file is validated and loaded individually, supporting both JSON and YAML formats.

[sentry]

Bug: The comma-separated string for --params-file is split using split(',') without trimming whitespace or filtering empty strings, causing errors for common inputs like "file1.json, file2.yaml".
_{Severity: MEDIUM}

Suggested Fix

Modify the string parsing to handle whitespace and empty strings gracefully. Instead of file.split(','), use a more robust method like file.tokenize(',').collect { it.trim() }.findAll { it }. This will split the string, trim whitespace from each resulting path, and remove any empty entries before processing, aligning with existing patterns in the codebase for handling comma-separated values.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: modules/nextflow/src/main/groovy/nextflow/cli/CmdRun.groovy#L690

Potential issue: The code at line 690 splits the `--params-file` string by commas using
`file.split(',')`. This method does not trim whitespace from the resulting file paths.
If a user provides a list with spaces after commas (e.g., `"file1.json, file2.yaml"`),
the subsequent call to `FileHelper.asPath()` will receive a path with a leading space
(e.g., `" file2.yaml"`) and throw an `IllegalArgumentException`. Similarly, trailing or
consecutive commas will produce empty strings, also causing an exception. This deviates
from the established pattern in the codebase for parsing comma-separated lists, which
typically involves trimming and filtering empty entries.

_{Did we get this right? 👍 / 👎 to inform future reviews.}