chore(backend/security): drop legacy duplicate Intune CA PEMs

intune-root-ca.pem and intune-intermediate-ca.pem are bit-for-bit duplicates
of intune-root-2030.pem and intune-intermediate-mdm-2026.pem (matching SHA1
fingerprints A1:97:D6:... and B7:E4:96:...). The post-9af3de15 loader globs
intune-root-*.pem and intune-intermediate-*.pem and dedupes by thumbprint,
so the duplicates were silently de-duped at load. Remove them now to make
the bundle self-explanatory: one PEM per real CA, name encodes its NotAfter.

Verified by running CertificateValidatorTests (8/8 incl. the real-device-cert
happy-path) which loads the bundle via the same glob path the runtime uses.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Backend/AutopilotMonitor.Functions/Security/Certificates/intune-intermediate-ca.pem

@@ -1,28 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIEfTCCAmWgAwIBAgIQQt4O1ZNyWaBPqw1mUq1F8jANBgkqhkiG9w0BAQsF
-ADA4MTYwNAYDVQQDEy1NaWNyb3NvZnQgSW50dW5lIFJvb3QgQ2VydGlmaWNh
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-8Qu3bX/Ng9OnxLnpGi8mCIvPCkPu3oo1RtHxjf/tQtdSE4V1/8mggYLNNftj
-Wk6ElqA+gRGYgJCssJrfG/bRYk+9ZQjavu3oG0B+SD7j3UeAOQqoOaPi8faF
-95tpgpVfJqQ6bm9wqBdODWfE4TYIPd0QG5nsYr86JThEtsL36U9j74wC33+4
-YHV4UviUiycyQiQQCSIFxSY2u9cLpFO4rjM+Qe/n8KWQURTW8i3wUFReVrMp
-9l+y70GklU/HHkXv8SDtFi6Q0+aK2duUhbHr+8P2nPuPNetfryVsdE+RVL4p
-FWEfIvbOKOI5EQj3Bh4/XkbhQtZk+FR7VkUIm5A9Kp+OzsQADkYhWE1N4xL/
-ysfRWmOcjB1MT1m7Zfie3YsR7j+rY4NLb+snuHqqpYRDSZpngZAJgRYHI1xS
-UxOk+zJ8XyHG+eyeZdfwlrWLKuMJEFw4pczs0Q==
------END CERTIFICATE-----

src/Backend/AutopilotMonitor.Functions/Security/Certificates/intune-root-ca.pem

@@ -1,33 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIFaTCCA1GgAwIBAgIQWDldDibkr6lFMz6rqUVDRDANBgkqhkiG9w0BAQsF
-ADA4MTYwNAYDVQQDEy1NaWNyb3NvZnQgSW50dW5lIFJvb3QgQ2VydGlmaWNh
-dGlvbiBBdXRob3JpdHkwHhcNMjUwOTE1MDAwMDAwWhcNMzAwOTE1MDAwMDAw
-WjA4MTYwNAYDVQQDEy1NaWNyb3NvZnQgSW50dW5lIFJvb3QgQ2VydGlmaWNh
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-AQDpcRMWOOO5oDbbLnOV2SnaqN5NuQoEaE7nIUuH/3dKtqL/ZSRqvpNgKUyI
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-E1fSG/TH/wTAQHywZJ4cwKV2itgVr1QwF5yShozUerrwmQ+QnEb/5gthJzKl
-eb8lUW1FtHCaMWiEVhflUpQCDJzYgvZJOhFQ6l0CD+eR1Oz6scDj/UxJPBEv
-NKB4G5m1b93gYKZ10mtK0a3Qi4df5A+8P44AhDI6zaG2GrmF7EX6vLFOVdPC
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-RcD1dsKKW+kl33K5XW7Q0Ra7KcMiLsvqHffhrYsgmllTGtpCgDLGl1H1vP9/
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-Af8CAQEwFgYDVR0lAQH/BAwwCgYIKwYBBQUHAwIwEAYJKwYBBAGCNxUBBAMC
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-psliPGmpv9N5I35132b8CfwXpSBmqTTcN0UMBUKgZAV2AUqjNml8B7bZw8h++
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-pYAyVLPiMvkT/HNZ0mnKeTES1xYONSV27UVzQHhQ6CxAKXiPS8Y
------END CERTIFICATE-----