chore: dsconfig base schema - github

[yesoreyeram]

• added dsconfig schema
• fixed the stargazers test to consistently return timestamp
• fixed migrated from backend.NewGrafanaCfg to config.NewGrafanaCfg ( changes in plugin SDK ). Old property deprecated and so the plugin is failing with lint
• refactored the parsing logic for app id and installation id ( to support both number and string formats. String is the desired format and consistent with the frontend. But sometimes yaml provisioning and legacy stuff returns them as number )
• Added githubPlan in backend settings model for feature parity with frontend.

[Copilot]

Pull request overview

Adds a dsconfig-backed base schema for the GitHub datasource plugin, commits the generated schema artifacts, and ensures those artifacts ship with the built plugin bundle. It also adjusts backend settings parsing to tolerate legacy appId/installationId representations and updates dependencies/build wiring accordingly.

Changes:

• Introduce dsconfig schema source (pkg/schema/dsconfig.json), Go helpers/tests, and generated schema artifacts (pkg/schema/*.gen.json).
• Package schema artifacts (and skills) into dist/ via a new root webpack.config.ts and updated package.json build/dev scripts.
• Normalize legacy appId / installationId parsing in pkg/models/settings.go and update tests; minor test determinism fix and SDK config API update.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
webpack.config.ts	Extends scaffolded webpack config to copy schema artifacts (and skills) into the built bundle.
pkg/schema/dsconfig.json	Adds dsconfig “single source of truth” schema for plugin settings.
pkg/schema/schema.go	Embeds dsconfig schema and produces SDK plugin schema object.
pkg/schema/schema_test.go	Adds artifact generation via go generate and runs dsconfig conformance tests.
pkg/schema/schema.gen.json	Committed generated plugin schema (v0alpha1).
pkg/schema/settings.gen.json	Committed generated settings schema (v0alpha1).
pkg/schema/settings.examples.gen.json	Committed generated settings examples artifact.
pkg/models/settings.go	Adds legacy-tolerant JSON unmarshal for appId/installationId and adds githubPlan for frontend parity.
pkg/models/settings_test.go	Updates expectations for the new normalized appId/installationId representation.
pkg/github/stargazers_test.go	Makes time zone formatting deterministic for golden output.
pkg/github/sql_handler_test.go	Switches to config.NewGrafanaCfg per updated plugin SDK API.
package.json	Bumps version and switches build/dev scripts to use the new root webpack config.
go.mod	Updates Go/tooling and dependency versions; adds dsconfig modules.
go.sum	Updates module checksums to match go.mod changes.
cspell.config.json	Adds dsconfig-related words and formats ignore list.
CHANGELOG.md	Documents 2.8.2 changes and adjusts prior formatting.

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