Add e2e/bcr to bazelignore #7

Job	Run time
build	9m 4s
package (windows-2022, x64_windows, dist_zip)	16m 9s
package (macos-14, darwin_arm64, dist_zip)	8m 43s
package (windows-2022, x64_x86_windows, dist_zip)	15m 8s
package (macos-14-large, darwin_x86_64, dist_zip)	2s
	49m 6s

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