docs: Update recommended version to Postgres 17

[mastercactapus]

Description:

This pull request updates the recommended and default PostgreSQL version from 13 to 17 across the codebase, build scripts, and documentation. The changes ensure that all environments, scripts, and documentation consistently use PostgreSQL 17, aligning development, testing, and deployment practices.

PostgreSQL version updates:

• Updated the default PostgreSQL version from 13 to 17 in the Makefile by changing the PG_VERSION variable.
• Changed the default version to 17 in the start_postgres.sh and stop_postgres.sh scripts used in CI build environments. [1] [2]

Documentation updates:

• Revised documentation in docs/development-setup.md and docs/getting-started.md to recommend PostgreSQL 17 as the preferred version. [1] [2]

Cypress environment cleanup:

• Removed the Cypress environment Dockerfile and related PostgreSQL start/stop scripts, simplifying the CI setup and removing PostgreSQL 13-specific commands. [1] [2] [3]

Code quality script update:

• Removed the Cypress version check from codecheck.sh, as the Cypress environment Dockerfile was deleted.