Remove code related to nomad watch deployments

[dangra]

Change Summary

Another iteration of Nomad code removal

Related to: #3231

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Documentation

• Fresh Produce
• In superfly/docs, or asked for help from docs team
• n/a

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ *net.OpError: read udp 10.51.18.187:62676->9.9.9.9:53: i/o timeout github.com/superfly/flyctl/internal/sentry in C... View Issue
• ‼️ *errors.joinError: smoke checks for 28756edb094128 failed: the app appears to be crashing github.com/superfly/flyctl/internal/sentry in C... View Issue
• ‼️ **runtime.TypeAssertionError: interface conversion: interface {} is nil, not client.Client github.com/superfly/flyctl/internal/sentry in R... View Issue
• ‼️ *errors.errorString: error acquiring leases on all machines github.com/superfly/flyctl/internal/sentry in C... View Issue
• ‼️ *errors.joinError: smoke checks for 6e82dd3b797648 failed: the app appears to be crashing github.com/superfly/flyctl/internal/sentry in C... View Issue

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