test: simplify Bun detection in tests (#544)

Author: sethamus

tests/rules/no-duplicate-definitions.test.js

@@ -153,10 +153,8 @@ ruleTester.run("no-duplicate-definitions", rule, {
 				},
 			],
 		},
-		// This test case is skipped for non-Node environments like Bun
-		...(typeof process !== "undefined" &&
-		process.release?.name === "node" &&
-		!process.versions?.bun
+		// This test case is skipped when running on Bun
+		...(!process.versions.bun
 			? [
 					{
 						code: `

tests/rules/no-empty-definitions.test.js

@@ -138,10 +138,8 @@ ruleTester.run("no-empty-definitions", rule, {
 			code: "[^note]:",
 			options: [{ allowFootnoteDefinitions: ["   note   "] }],
 		},
-		// This test case is skipped for non-Node environments like Bun
-		...(typeof process !== "undefined" &&
-		process.release?.name === "node" &&
-		!process.versions?.bun
+		// This test case is skipped when running on Bun
+		...(!process.versions.bun
 			? [
 					{
 						code: "[Grüsse]: #",

tests/rules/no-missing-link-fragments.test.js

@@ -277,11 +277,8 @@ ruleTester.run("no-missing-link-fragments", rule, {
 		`,
 
 		// Headings with emojis and accented characters
-		// This test case is skipped for non-Node environments like Bun
-		...(typeof process !== "undefined" &&
-		process.release &&
-		process.release.name === "node" &&
-		(!process.versions || !process.versions.bun)
+		// This test case is skipped when running on Bun
+		...(!process.versions.bun
 			? [
 					dedent`
 					# Heading with 🚀 emoji
@@ -749,11 +746,8 @@ ruleTester.run("no-missing-link-fragments", rule, {
 			],
 		},
 		// Headings with accented characters
-		// This test case is skipped for non-Node environments like Bun
-		...(typeof process !== "undefined" &&
-		process.release &&
-		process.release.name === "node" &&
-		(!process.versions || !process.versions.bun)
+		// This test case is skipped when running on Bun
+		...(!process.versions.bun
 			? [
 					{
 						code: dedent`

tests/rules/no-reference-like-urls.test.js

@@ -1314,10 +1314,8 @@ ruleTester.run("no-reference-like-urls", rule, {
 				},
 			],
 		},
-		// This test case is skipped for non-Node environments like Bun
-		...(typeof process !== "undefined" &&
-		process.release?.name === "node" &&
-		!process.versions?.bun
+		// This test case is skipped when running on Bun
+		...(!process.versions.bun
 			? [
 					{
 						code: dedent`

tests/rules/no-unused-definitions.test.js

@@ -199,10 +199,8 @@ Mercury[^mercury]
 				},
 			],
 		},
-		// This test case is skipped for non-Node environments like Bun
-		...(typeof process !== "undefined" &&
-		process.release?.name === "node" &&
-		!process.versions?.bun
+		// This test case is skipped when running on Bun
+		...(!process.versions.bun
 			? [
 					{
 						code: "[Grüsse]: https://example.com/",