[Linter] Remove Math Font Size rule from editor linter (#2240)

## Summary:
A content editing lint rule exists that prevents the changing of the font size of math content. There is no historical or documented reason for having this rule, so it is being removed to give content creators more flexibility in how they configure content.

Issue: LEMS-2843

## Test plan:
1. Open an exercise in the editor ([ZND for testing](https://www.khanacademy.org/internal-courses/test-everything/test-everything-2-without-mastery/te-numeric-input/e/numeric-input-exercise-examples))
2. Add some math text with font size indicated
   * i.e. `$\large{123}$`
3. Notice that no linting error appears on the right side of the preview

## Affected behavior
### Before:
![Lint Message - Before](https://github.com/user-attachments/assets/c459377c-9987-4328-a9b5-df43cda0a5df)

### After:
![Lint Message - After](https://github.com/user-attachments/assets/df634360-024e-41e1-8cd8-0b8e1e6173b9)

Author: mark-fitzgerald

Reviewers: nishasy, #perseus

Required Reviewers:

Approved By: nishasy

Checks: ✅ Publish npm snapshot (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Publish npm snapshot (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Publish Storybook to Chromatic (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x)

Pull Request URL: #2240

.changeset/gorgeous-dragons-collect.md

@@ -0,0 +1,5 @@
+---
+"@khanacademy/perseus-linter": patch
+---
+
+[Linter] Remove Math Font Size rule from editor linter

packages/perseus-linter/src/__tests__/rules.test.ts

@@ -20,7 +20,6 @@ import mathAdjacentRule from "../rules/math-adjacent";
 import mathAlignExtraBreakRule from "../rules/math-align-extra-break";
 import mathAlignLinebreaksRule from "../rules/math-align-linebreaks";
 import mathEmptyRule from "../rules/math-empty";
-import mathFontSizeRule from "../rules/math-font-size";
 import mathFracRule from "../rules/math-frac";
 import mathNestedRule from "../rules/math-nested";
 import mathStartsWithSpaceRule from "../rules/math-starts-with-space";
@@ -375,22 +374,6 @@ describe("Individual lint rules tests", () => {
     // @ts-expect-error - TS2554 - Expected 3 arguments, but got 2.
     expectPass(mathNestedRule, ["$\\text{4}x$", "inline $\\text{4}x$ math"]);
 
-    // @ts-expect-error - TS2554 - Expected 3 arguments, but got 2.
-    expectWarning(mathFontSizeRule, [
-        "$\\tiny{x}$",
-        "inline $\\Tiny{x}$ math",
-        "$a \\small{x} b$",
-        "$\\large{ xyz }$",
-        "$ \\Large { x } $",
-        "$\\LARGE{x}$",
-        "$\\huge{x}$",
-        "$\\Huge{x}$",
-        "$\\normalsize{x}$",
-        "$\\scriptsize{x}$",
-    ]);
-    // @ts-expect-error - TS2554 - Expected 3 arguments, but got 2.
-    expectPass(mathFontSizeRule, ["$\\sqrt{x}$", "inline $\\sqrt{x}$ math"]);
-
     // @ts-expect-error - TS2554 - Expected 3 arguments, but got 2.
     expectWarning(mathWithoutDollarsRule, [
         "One half: \\frac{1}{2}!",

packages/perseus-linter/src/rules/all-rules.ts

@@ -24,7 +24,6 @@ import MathAdjacent from "./math-adjacent";
 import MathAlignExtraBreak from "./math-align-extra-break";
 import MathAlignLinebreaks from "./math-align-linebreaks";
 import MathEmpty from "./math-empty";
-import MathFontSize from "./math-font-size";
 import MathFrac from "./math-frac";
 import MathNested from "./math-nested";
 import MathStartsWithSpace from "./math-starts-with-space";
@@ -56,7 +55,6 @@ export default [
     MathAlignExtraBreak,
     MathAlignLinebreaks,
     MathEmpty,
-    MathFontSize,
     MathFrac,
     MathNested,
     MathStartsWithSpace,