Add scheduler hint sample

[k0ka]

for #434

add scheduler hints for server

[Copilot]

Pull request overview

Adds support and documentation for Nova server-create scheduler hints (specifically for placing servers into an existing server group) in the Compute v2 SDK workflow.

Changes:

• Add schedulerHints request option for createServer, serialized as top-level os:scheduler_hints alongside the server object.
• Update Compute v2 API server-create request shaping to nest only server fields under server.* while allowing top-level siblings (like scheduler hints).
• Add sample + docs + sample test coverage for creating a server in a server group; improve sample cleanup reliability when deleting servers/networks.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unit/Compute/v2/ServiceTest.php	Adds unit coverage asserting os:scheduler_hints is sent alongside server on create.
tests/sample/Compute/v2/TestCase.php	Ensures server addresses are retrieved before deletion so dependent network cleanup can run after delete.
tests/sample/Compute/v2/ServerGroupTest.php	Adds an integration/sample test demonstrating server creation inside a server group via scheduler hints.
src/Compute/v2/Params.php	Introduces schedulerHints parameter schema (sent as os:scheduler_hints).
src/Compute/v2/Api.php	Refactors postServer JSON shaping to use per-param JSON paths under server, enabling top-level scheduler hints.
samples/Compute/v2/server_groups/create_server.php	New executable sample showing schedulerHints.group usage on server create.
doc/services/compute/v2/server-groups.rst	Documents the new “Create a server in a group” workflow and links the sample.
AGENTS.md	Adds guidance for reusing resources in sample tests via @depends patterns.

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