feat: upgrade to the new ts-server-boilerplate(MAPCO-10112)

[almog8k]

Context

Upgrades cache-seeder from the old MapColonies boilerplate to the new ts-server-boilerplate generation, using the already-migrated job-tracker as the reference. Preserves the two service-specific traits the boilerplate doesn't have: the worker polling mainLoop and the MapProxy Python integration (Docker venv + cmd.ts). The service stays on Jest and intentionally skips OpenAPI (it's a routeless worker).

What changed

• Config: @map-colonies/config + commonBoilerplateV3 schema (src/common/config.ts); restructured config/*.json (telemetry reshaped, httpRetry moved top-level due to schema unevaluatedProperties, openapiConfig added).
• Bootstrap: async getApp/registerExternalValues, ESM instrumentation.mts, js-logger v5, prom-client metrics (replaces OTel meter), @map-colonies/tracing. Fixed a latent terminus onSignal misplacement.
• Tooling: @map-colonies/tsconfig + path aliases, ESLint 9 flat config, prettier 3, tsc-alias build, husky v9, Node-24 Dockerfile with --import instrumentation.mjs + offline config.
• Deps: migrated + version-bumped to match the boilerplate; removed unused packages (http-status-codes, supertest, @types/supertest, @types/multer, jest-create-mock-instance, standalone commitlint); moved @faker-js/faker to devDependencies.
• Helm: added configManagement (CONFIG_*) env for the new config library (offline mode); removed dead OTel-push metrics env.
• Tests: ts-jest with path-alias mapper, sync logger mock, direct registerDependencies setup.

[CL-SHLOMIKONCHA]

Good job!
few comment
and we should talk about the IConfig uses, in general we should remove it and use the ConfigType as type