plugins/rest: masks more headers in decision logs #9431

Job	Run time
Generate Code	2m 0s
Go Lint	1m 40s
Rego PR checks	1m 47s
Check Generated	34s
Go compat build/test (ubuntu-22.04, 1.19)	2m 7s
Go Test (linux)	4m 42s
Go Build (linux amd64)	2m 31s
Go compat build/test (macos-latest, 1.19)	1m 53s
Go Test (darwin)	7m 3s
Go Build (linux arm64)	2m 27s
Go Race Detector	5m 39s
Go Build (windows)	3m 11s
WASM	5m 39s
Go Build (darwin)	1m 31s
smoke-test-binaries (ubuntu-22.04, opa_linux_amd64)	20s
smoke-test-binaries (ubuntu-22.04, opa_linux_amd64_static, disabled)	14s
docker image smoke test	42s
smoke-test-binaries (macos-latest, opa_darwin_amd64)	37s
smoke-test-binaries (windows-latest, opa_windows_amd64.exe)	48s
	45m 25s

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