apply -f: detect binary protobuf payload by content

[Copilot]

• Explore codebase and understand apply command structure
• Add isJSONContent helper — detects JSON by first non-whitespace byte ({/[ → true, binary protobuf → false)
• Add parseActions helper — does detection + parsing, returns []parsedAction
• apply now takes []parsedAction directly (no raw bytes, no format flag)
• Command.RunE calls parseActions before apply (parse then execute)
• Extract JSON parsing into parseActionFromJSON
• Move all input parsing implementations to new parse.go
• Rename apply_test.go to parse_test.go
• Tests updated and passing

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Allow passing protobuf searlized payload in apply -f command</issue_title>
<issue_description>Expected experience:

aks-flex-node apply -f <input.json>
aks-flex-node apply -f <input.binpb>
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Allow passing protobuf searlized payload in apply -f command #103

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[bcho]

@copilot

[bcho]

@copilot

[bcho]

extract this part to a function parseActionFromJSON. Move input parsing implementations to a new file.

[Copilot]

Done in 725bb94. The JSON parsing block is now extracted into parseActionFromJSON and all input parsing implementations (isJSONContent, parseActions, parseActionFromJSON, parseAction, parseActionFromProto) have been moved to the new parse.go file.

[bcho]

@copilot

[bcho]

rename this file to parse_test.go

[Copilot]

Done in 494e582. apply_test.go has been renamed to parse_test.go.