[legacy-framework] Fix duplicated Set-Cookie header

[JuanM04]

Closes: blitz-js/legacy-framework#406

What are the changes and their implications?

This changes the setCookie function in sessions.ts. Instead of just appending a cookie header to Set-Cookie, it looks for duplicates. It shouldn't break anything

Checklist

• Changes covered by tests (tests added if needed)
• PR submitted to blitzjs.com for any user facing changes

[github-actions]

Size Change: +485 B (0%)

Total Size: 231 kB

Filename	Size	Change
packages/core/server/dist/blitzjs-core-server.cjs.dev.js	13.4 kB	+165 B (+1%)
packages/core/server/dist/blitzjs-core-server.cjs.prod.js	13.4 kB	+160 B (+1%)
packages/core/server/dist/blitzjs-core-server.esm.js	13.3 kB	+160 B (+1%)

ℹ️ View Unchanged

Filename	Size	Change
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packages/babel-preset/dist/blitzjs-babel-preset.cjs.js	150 B	0 B
packages/babel-preset/dist/blitzjs-babel-preset.cjs.prod.js	1.69 kB	0 B
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packages/blitz/cli/dist/blitz-cli.cjs.dev.js	1.47 kB	0 B
packages/blitz/cli/dist/blitz-cli.cjs.js	142 B	0 B
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packages/blitz/custom-server/dist/blitz-custom-server.cjs.js	149 B	0 B
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packages/blitz/dist/blitz.cjs.dev.js	355 B	0 B
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packages/file-pipeline/dist/blitzjs-file-pipeline.cjs.dev.js	6.88 kB	0 B
packages/file-pipeline/dist/blitzjs-file-pipeline.cjs.js	150 B	0 B
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packages/generator/dist/blitzjs-generator.cjs.dev.js	13.7 kB	0 B
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packages/server/dist/blitzjs-server.cjs.js	145 B	0 B
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packages/server/dist/blitzjs-server.esm.js	12.4 kB	0 B

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