[api-minor] Remove the normalizeWhitespace option in the PDFPageProxy.{getTextContent, streamTextContent} methods (issue 14519, PR 14428 follow-up)

With these changes, we'll now *always* replace all whitespaces with standard spaces (0x20). This behaviour is already, since many years, the default in both the viewer and the browser-tests.

test/driver.js

@@ -644,7 +644,6 @@ class Driver {
               // The text builder will draw its content on the test canvas
               initPromise = page
                 .getTextContent({
-                  normalizeWhitespace: true,
                   includeMarkedContent: true,
                 })
                 .then(function (textContent) {

test/unit/api_spec.js

@@ -1966,7 +1966,6 @@ describe("api", function () {
     it("gets text content", async function () {
       const defaultPromise = page.getTextContent();
       const parametersPromise = page.getTextContent({
-        normalizeWhitespace: true,
         disableCombineTextItems: true,
       });