[dev-tool] try / and \ path separators when checking bundling war…

…nings (#24386)

It turns out that on windows some warnings are reported with `\`
separator while others with `/` at the same time, e.g.,

str
../../../common/temp/node_modules/.pnpm/[email protected]/node_modules/chai/lib/chai.js
str
C:\github\jeremymeng\js-main\common\temp\node_modules\.pnpm\[email protected]\node_modules\sinon\pkg\sinon-esm.js

This PR changes to try both separators when checking whether to suppress
bundle warnings.

---------

Co-authored-by: Will Temple <[email protected]>

common/tools/dev-tool/src/config/rollup.base.config.ts

@@ -69,8 +69,7 @@ export function sourcemapsExtra() {
 export type WarningInhibitor = (warning: RollupWarning) => boolean;
 
 function matchesPathSegments(str: string | undefined, segments: string[]): boolean {
-  // Reported warnings use "/"
-  return str?.includes(segments.join("/")) ?? false;
+  return !str ? false : str.includes(segments.join("/")) || str.includes(segments.join("\\"));
 }
 
 function ignoreNiseSinonEval(warning: RollupWarning): boolean {