Fix Azure startTask command concatenation

[adamrtalbot]

• Fix Azure Batch startTask concatenation issue (nf-azure startTask concatenation fails silently #6300) by replacing commands concatenated with semi colon with &&.

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[pditommaso]

Not sure to understand what's this is solving (actually tests are broken)

[bentsherman]

I also don't understand how changing to && fixes the problem reported in the issue

@pditommaso The CI failure is happening across all PRs, looks like a quota issue:

Launching `./test-complexpaths.nf` [maniac_sax] DSL2 - revision: 71e6f6d34a
ERROR ~ Error executing process > 'foo'

Caused by:
  Status code 409, "{
    "odata.metadata":"https://nfbatchtest.westeurope.batch.azure.com/$metadata#Microsoft.Azure.Batch.Protocol.Entities.Container.errors/@Element","code":"ActiveJobAndScheduleQuotaReached","message":{
      "lang":"en-US","value":"Active job and job schedule quota for the account has been reached.\nRequestId:3a4b330c-eafc-4fbc-af7f-a7aa54415c64\nTime:2025-07-23T17:10:56.4462633Z"
    }
  }"

[pditommaso]

Looking into that