test: Reduce test output noise (#53606)

The errors, warnings, and logs from these tests are expected for each
test case. However, their presence creates noise the reduce the
comprehensibility of the test output. Intentionally suppressing them
simplifies the test output, making it easier to identify new, unexpected
console output.

packages/block-editor/src/components/block-list/test/block-invalid-warning.native.js

@@ -11,6 +11,13 @@ import {
 
 setupCoreBlocks();
 
+beforeEach( () => {
+	// Intentionally suppress the expected console errors and warnings to reduce
+	// noise in the test output.
+	jest.spyOn( console, 'error' ).mockImplementation( () => {} );
+	jest.spyOn( console, 'warn' ).mockImplementation( () => {} );
+} );
+
 describe( 'Block invalid warning', () => {
 	it( 'shows invalid placeholder', async () => {
 		// Arrange

packages/block-library/src/embed/test/index.native.js

@@ -200,6 +200,10 @@ beforeEach( () => {
 		MOCK_EMBED_PHOTO_SUCCESS_RESPONSE,
 		MOCK_BAD_EMBED_PROVIDER_RESPONSE,
 	] );
+
+	// Intentionally suppress the expected console logs to reduce noise in the
+	// test output.
+	jest.spyOn( console, 'log' ).mockImplementation( () => {} );
 } );
 
 afterAll( () => {