chore: update transifex scripts to api v3

Transifex is sunsetting anything below v3 later this year. Let's
get ahead of our scripts unexpectedly failing.

- Switch 'reactifex' dev dep to our maintained fork at
  '@edx/reactifex' (it has an older released version number,
  but it's still maintained unlike the original)
- Update Makefile commands for new v3 transifex API

package-lock.json

@@ -4114,6 +4114,59 @@
         }
       }
     },
+    "@edx/reactifex": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/@edx/reactifex/-/reactifex-1.0.3.tgz",
+      "integrity": "sha512-zJjD3ym4KOQ2sa+lwR08jgospMyiRTSRqK6Mxi1VMQ+sqxZxWFCGymV+mqLRPHPAJ/z+qhblsVuWeb0N9qI5ww==",
+      "dev": true,
+      "requires": {
+        "axios": "^0.21.1",
+        "yargs": "^17.1.1"
+      },
+      "dependencies": {
+        "string-width": {
+          "version": "4.2.3",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+          "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.1"
+          }
+        },
+        "strip-ansi": {
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+          "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^5.0.1"
+          }
+        },
+        "yargs": {
+          "version": "17.3.1",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.3.1.tgz",
+          "integrity": "sha512-WUANQeVgjLbNsEmGk20f+nlHgOqzRFpiGWVaBrYGYIGANIIu3lWjoyi0fNlFmJkvfhCZ6BXINe7/W2O2bV4iaA==",
+          "dev": true,
+          "requires": {
+            "cliui": "^7.0.2",
+            "escalade": "^3.1.1",
+            "get-caller-file": "^2.0.5",
+            "require-directory": "^2.1.1",
+            "string-width": "^4.2.3",
+            "y18n": "^5.0.5",
+            "yargs-parser": "^21.0.0"
+          }
+        },
+        "yargs-parser": {
+          "version": "21.0.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.0.1.tgz",
+          "integrity": "sha512-9BK1jFpLzJROCI5TzwZL/TU4gqjK5xiHV/RfWLOahrjAko/e4DJkRDZQXfvqAsiZzzYhgAzbgz6lg48jcm4GLg==",
+          "dev": true
+        }
+      }
+    },
     "@formatjs/ecma402-abstract": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-1.5.0.tgz",
@@ -21194,12 +21247,6 @@
         "prop-types": "^15.6.2"
       }
     },
-    "reactifex": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/reactifex/-/reactifex-1.1.1.tgz",
-      "integrity": "sha512-HH2N/b5tRxh7ypIgCRsiBl/CTxRkTEPf9DhIstaM6hne4WiwM5/bBbWuvVlRZc/i3FdqZED3pZ//6n4mtxma4w==",
-      "dev": true
-    },
     "read-pkg": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",