fix(push): downgrade JSON schema validation errors to warnings (PSGO-198)

kbc push was blocking users from pushing changes to their branch when
unrelated branches had invalid configs. The server already accepted
those configs, so the CLI was stricter than the source of truth.

Aligns push with pull behaviour: validation failures are now shown as
warnings and push proceeds, since the server determines what is valid.

Also updates the pull warning message - it no longer says push will
be blocked when the project is in an invalid state.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Matovidlo

pkg/lib/operation/project/sync/pull/operation.go

@@ -143,7 +143,7 @@ func Run(ctx context.Context, projectState *project.State, o Options, d dependen
 		logger.Warn(ctx, "")
 		logger.Warn(ctx, `The project has been pulled, but it is not in a valid state.`)
 		logger.Warn(ctx, `Please correct the problems listed above.`)
-		logger.Warn(ctx, `Push operation is only possible when project is valid.`)
+		logger.Warn(ctx, `Push will proceed with warnings for configs already accepted by the server.`)
 	}
 
 	// Log untracked paths

pkg/lib/operation/project/sync/push/operation.go

@@ -12,6 +12,7 @@ import (
 	"github.com/keboola/keboola-as-code/internal/pkg/project"
 	"github.com/keboola/keboola-as-code/internal/pkg/project/ignore"
 	"github.com/keboola/keboola-as-code/internal/pkg/telemetry"
+	"github.com/keboola/keboola-as-code/internal/pkg/utils/errors"
 	"github.com/keboola/keboola-as-code/pkg/lib/operation/project/local/encrypt"
 	"github.com/keboola/keboola-as-code/pkg/lib/operation/project/local/validate"
 	createDiff "github.com/keboola/keboola-as-code/pkg/lib/operation/project/sync/diff/create"
@@ -60,7 +61,10 @@ func Run(ctx context.Context, projectState *project.State, o Options, d dependen
 			ValidateJSONSchema: true,
 		}
 		if err := validate.Run(ctx, projectState, validateOptions, d); err != nil {
-			return err
+			logger.Warn(ctx, errors.Format(errors.PrefixError(err, "warning"), errors.FormatAsSentences()))
+			logger.Warn(ctx, "")
+			logger.Warn(ctx, "Validation warnings found, proceeding with push.")
+			logger.Warn(ctx, "The configs already exist on the server; the server is the source of truth.")
 		}
 	}