Use yaml node tags to enforce NUMAFLOW_DEBUG string type

[th0ger]

The repos are full of the following verbose templates:

containerTemplate:
  env:
    - name: NUMAFLOW_DEBUG
      value: "true" # DO NOT forget the double quotes!!!

Instead of the verbose comments, I suggest to use YAML node tags

      value: !!str "true"

This would also make the following valid:

      value: !!str true

Coverage:

$ grep -Rnw . -e 'value:[[:space:]]"true"'
./numaflow-go/pkg/sideinput/examples/simple_sideinput/README.md:69:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-go/pkg/sideinput/examples/simple_sideinput/pipeline.yaml:29:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-go/pkg/sideinput/examples/sideinput_function/README.md:71:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/examples/7-reduce-sliding-window.yaml:13:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/examples/7-reduce-sliding-window.yaml:20:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/examples/7-reduce-sliding-window.yaml:47:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/docs/development/debugging.md:24:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/docs/development/debugging.md:49:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/config/apps/redis/redis-minimal.yaml:69:              value: "true"
./numaflow/config/apps/kafka/kafka-minimal.yaml:83:              value: "true"
./numaflow/config/apps/kafka/kafka-minimal.yaml:85:              value: "true"
./numaflow/test/manifests/kustomization.yaml:22:          value: "true"
./numaflow/test/e2e/testdata/watermark.yaml:18:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/test/e2e/testdata/watermark.yaml:27:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/test/e2e/testdata/watermark.yaml:35:            value: "true" # DO NOT forget the double quotes!!!
./numaflow/test/e2e/testdata/watermark.yaml:44:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-python/examples/sideinput/simple-sideinput/pipeline.yaml:29:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-python/examples/sink/async_log/pipeline.yaml:28:                value: "true"
./numaflow-python/examples/sink/log/pipeline.yaml:28:                value: "true"
./numaflow-python/examples/reduce/counter/pipeline.yaml:25:              value: "true"
./numaflow-python/examples/map/flatmap/pipeline.yaml:21:              value: "true"
./numaflow-python/examples/map/flatmap/pipeline.yaml:32:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-python/examples/map/multiproc_map/pipeline.yaml:21:              value: "true"
./numaflow-python/examples/map/multiproc_map/pipeline.yaml:34:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-python/examples/mapstream/flatmap_stream/pipeline.yaml:27:              value: "true"
./numaflow-python/examples/mapstream/flatmap_stream/pipeline.yaml:40:            value: "true" # DO NOT forget the double quotes!!!
./numaflow-python/examples/reducestream/counter/pipeline.yaml:25:              value: "true"
./numaflow-python/examples/reducestream/sum/pipeline.yaml:25:              value: "true"

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