Chore: avoid loose equality assertions (#9415)

* Chore: avoid loose equality assertions

This updates the `no-restricted-syntax` configuration to disallow
`assert.equal` and `assert.notEqual` in favor of `assert.strictEqual`
and `assert.notStrictEqual`. It also fixes a few places where the tests
were relying on a loose equality check (e.g. comparing a single-element
    array to a string).

* Use assert.deepStrictEqual instead of assert.deepEqual

* Revert accidental fixture changes

Author: not-an-aardvark

test.js

@@ -39,7 +39,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
     });
 
@@ -80,7 +80,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
 
         it("should return a string in the correct format for warnings", () => {
@@ -119,7 +119,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
     });
 
@@ -160,7 +160,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
     });
 
@@ -209,7 +209,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
     });
 
@@ -269,7 +269,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
     });
 
@@ -307,7 +307,7 @@ describe("formatter:table", () => {
 
             const result = formatter(code);
 
-            assert.equal(result, expectedOutput);
+            assert.strictEqual(result, expectedOutput);
         });
     });
 });