Updated diagram to better reflect code naming.

[bswenka]

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Checklist

I applicable, I acknowledge that I have:

• Read the contributing guide
• Ran terraform fmt on all modified files
• Regenerated the relevant README.md files using tools/tfdoc.py
• Made sure all relevant tests pass

[wiktorn]

Thanks @bswenka. As far as I checked, the blueprint is not using the Identity Aware Proxy, so adding it to the diagram might be misleading. Otherwise looks good

[bswenka]

Good catch @wiktorn - I accidentally used an old version of the diagram, thank you. Fixed now.