fix: hide --input-file and --dry-run on no-input read-only commands

[margaretjgu]

Closes #378.

GET/HEAD commands with an empty input schema (e.g. es info) showed --input-file and --dry-run in --help even though both are no-ops there. defineCommand now takes a readOnly flag (set from the HTTP method in the es/kb/cloud registration layers) and skips both options when the command is read-only and its input schema has no fields.

Write commands with empty schemas keep --input-file since loose schemas pass the whole file through as the request body. GET-with-body APIs like es search keep both because their schemas have fields.

Most of the docs/cli/schema.json diff is the cloud namespace no longer promoting the two flags to namespace level, plus 64 es/kb commands losing them.

[github-actions]

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✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	1.11s
✅ REPOSITORY	gitleaks	yes		no	no	58.96s
✅ REPOSITORY	git_diff	yes		no	no	0.5s
✅ REPOSITORY	secretlint	yes		no	no	30.13s
✅ REPOSITORY	trivy	yes		no	no	18.47s
✅ TYPESCRIPT	eslint	6		0	0	5.68s

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