fix(ci): fix failing ci

We restored reuseExistingServer: true in both davinci-suites and journey-suites playwright configs to fix the port 5829 conflict that was causing all e2e-ci tasks to fail. The PR changed davinci-suites to reuseExistingServer: !process.env.CI (false in CI) expecting the "..." nx.json serialization to prevent concurrent server starts, but that serialization only applies within a single project — the two suites can still run concurrently and race for port 5829. With reuseExistingServer: true restored, concurrent tasks across both suites safely share whichever server is already listening on the port.