Support conditions in Bun.build

[Jarred-Sumner]

What does this PR do?

#9106 added support for bun --conditions and bun build --conditions, but left out passing conditions to Bun.build . This adds it

How did you verify your code works?

There is a test

[zackradisic]

lgtm

[github-actions]

❌ @Jarred-Sumner 2 files with test failures on bun-darwin-aarch64:

• test/js/node/http2/node-http2.test.js 1 failing
• test/js/third_party/prisma/prisma.test.ts 2 failing

View test output

^{#8569064c46f61a4775791b4352ff8b62ea531bd1}

[github-actions]

❌ @Jarred-Sumner 1 files with test failures on bun-darwin-x64:

• test/js/third_party/prisma/prisma.test.ts 2 failing

View test output

^{#8569064c46f61a4775791b4352ff8b62ea531bd1}

[github-actions]

❌ @Jarred-Sumner 1 files with test failures on linux-x64:

• test/js/third_party/prisma/prisma.test.ts 1 failing

View test output

^{#8569064c46f61a4775791b4352ff8b62ea531bd1}

[github-actions]

❌ @Jarred-Sumner 2 files with test failures on linux-x64-baseline:

• test/js/node/watch/fs.watchFile.test.ts 1 failing
• test/js/third_party/prisma/prisma.test.ts 1 failing

View test output

^{#8569064c46f61a4775791b4352ff8b62ea531bd1}

[github-actions]

❌🪟 @Jarred-Sumner, there are 12 test regressions on Windows x86_64

• test\cli\run\env.test.ts
• test\cli\run\transpiler-cache.test.ts
• test\js\bun\dns\resolve-dns.test.ts
• test\js\bun\http\fetch-file-upload.test.ts
• test\js\bun\http\bun-server.test.ts
• test\js\bun\shell\shelloutput.test.ts
• test\js\bun\shell\throw.test.ts
• test\js\node\dns\node-dns.test.js
• test\js\node\process\process-args.test.js
• test\js\web\fetch\body-stream-excess.test.ts
• test\js\web\fetch\body-stream.test.ts
• test\js\web\workers\worker.test.ts

Full Test Output