test, simple: Don't parse the flag in init()

[YutaroHayakawa]

Doing the flag.Parse in init() erases the Go Test's builtin options such as -test.v. The right place to do that is TestMain and we even do that already. Remove the one in the init() function.

=== Before the change ===

Usage of ./simple.test:
-check_server string
path to command for check server
-checked_only
skip tests which skip type checking
-eval_server string
path to command for eval server
-parse_server string
path to command for parse server
-pipe
Use pipes instead of gRPC
-pipe_base64
Use base64 encoded wire format proto in pipes (if disabled, use JSON). (default true)
-pipe_pings
Enable pinging pipe client to subprocess status.
-server string
path to binary for server when no phase-specific server defined
-skip_check
force skipping the check phase
-skip_test value
name(s) of tests to skip. can be set multiple times. to skip the following tests: f1/s1/t1, f1/s1/t2, f1/s2/*, f2/s3/t3, you give the arguments --skip_test=f1/s1/t1,t2;s2 --skip_test=f2/s3/t3

=== After the change ===

Usage of ./simple.test:
-check_server string
path to command for check server
-checked_only
skip tests which skip type checking
-eval_server string
path to command for eval server
-parse_server string
path to command for parse server
-pipe
Use pipes instead of gRPC
-pipe_base64
Use base64 encoded wire format proto in pipes (if disabled, use JSON). (default true)
-pipe_pings
Enable pinging pipe client to subprocess status.
-server string
path to binary for server when no phase-specific server defined
-skip_check
force skipping the check phase
-skip_test value
name(s) of tests to skip. can be set multiple times. to skip the following tests: f1/s1/t1, f1/s1/t2, f1/s2/*, f2/s3/t3, you give the arguments --skip_test=f1/s1/t1,t2;s2 --skip_test=f2/s3/t3
-test.bench regexp
run only benchmarks matching regexp
-test.benchmem
print memory allocations for benchmarks
-test.benchtime d
run each benchmark for duration d or N times if d is of the form Nx (default 1s)
-test.blockprofile file
write a goroutine blocking profile to file
-test.blockprofilerate rate
set blocking profile rate (see runtime.SetBlockProfileRate) (default 1)
-test.count n
run tests and benchmarks n times (default 1)
-test.coverprofile file
write a coverage profile to file
-test.cpu list
comma-separated list of cpu counts to run each test with
-test.cpuprofile file
write a cpu profile to file
-test.failfast
do not start new tests after the first test failure
-test.fullpath
show full file names in error messages
-test.fuzz regexp
run the fuzz test matching regexp
-test.fuzzcachedir string
directory where interesting fuzzing inputs are stored (for use only by cmd/go)
-test.fuzzminimizetime value
time to spend minimizing a value after finding a failing input (default 1m0s)
-test.fuzztime value
time to spend fuzzing; default is to run indefinitely
-test.fuzzworker
coordinate with the parent process to fuzz random values (for use only by cmd/go)
-test.gocoverdir string
write coverage intermediate files to this directory
-test.list regexp
list tests, examples, and benchmarks matching regexp then exit
-test.memprofile file
write an allocation profile to file
-test.memprofilerate rate
set memory allocation profiling rate (see runtime.MemProfileRate)
-test.mutexprofile string
write a mutex contention profile to the named file after execution
-test.mutexprofilefraction int
if >= 0, calls runtime.SetMutexProfileFraction() (default 1)
-test.outputdir dir
write profiles to dir
-test.paniconexit0
panic on call to os.Exit(0)
-test.parallel n
run at most n tests in parallel (default 4)
-test.run regexp
run only tests and examples matching regexp
-test.short
run smaller test suite to save time
-test.shuffle string
randomize the execution order of tests and benchmarks (default "off")
-test.skip regexp
do not list or run tests matching regexp
-test.testlogfile file
write test action log to file (for use only by cmd/go)
-test.timeout d
panic test binary after duration d (default 0, timeout disabled)
-test.trace file
write an execution trace to file
-test.v
verbose: print additional output

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[TristonianJones]

/gcbrun

[TristonianJones]

To my knowledge, we've stopped using this test driver within the other CEL repos, but have kept it present in the event it proves useful to others who are running conformance tests this way. This change seems okay to me.