Add ARM build flavors

Summary:
Adds support for ARM builds to our builds.

Internal to the build we get an option for a set of build architectures which include ARM and x64. This creates a new set of BUCK targets with the architecture suffix. So you can now do:

`buck2 run fbcode//cinderx:python3.14-arm64 --` and it'll launch Python w/ CinderX. On x64 this will run under QEMU.

You can also do `buck2 run fbcode//cinderx:python3.14-x64 --` to be explicit about what you want to launch but `buck2 run fbcode//cinderx:python3.14 --` will still default to x64.

Two Sandcastle jobs are setup but not currently enabled - one runs on x64 under QEMU... this is probably sufficient but I also setup one to run on actual arm hosts. Not sure if someone will be unhappy about us using this tier.

The QEMU tests can't currently make it through an entire run and probably need D85780300 before they will succeed.

Reviewed By: alexmalyshev

Differential Revision: D86441520

fbshipit-source-id: e222777a08b2cbefee2df18f5b83fd81fdad405f

Author: DinoV

cinderx/TestScripts/3.12-opt-arm64-failures.txt

@@ -0,0 +1,69 @@
+test.test_cmd_line_script
+test.test_ctypes
+test_cinderx.test___static__
+test_cinderx.test_asynclazyvalue
+test_cinderx.test_cinderjit
+test_cinderx.test_compiler.test_static.annotated
+test_cinderx.test_compiler.test_static.array
+test_cinderx.test_compiler.test_static.asyncs
+test_cinderx.test_compiler.test_static.augassign
+test_cinderx.test_compiler.test_static.binop
+test_cinderx.test_compiler.test_static.cached_property
+test_cinderx.test_compiler.test_static.checked_dict
+test_cinderx.test_compiler.test_static.checked_list
+test_cinderx.test_compiler.test_static.class_decorator
+test_cinderx.test_compiler.test_static.classmethod
+test_cinderx.test_compiler.test_static.compile
+test_cinderx.test_compiler.test_static.context_decorator
+test_cinderx.test_compiler.test_static.crange
+test_cinderx.test_compiler.test_static.dataclass
+test_cinderx.test_compiler.test_static.decl_visitor
+test_cinderx.test_compiler.test_static.dependencies
+test_cinderx.test_compiler.test_static.double
+test_cinderx.test_compiler.test_static.dynamic_return
+test_cinderx.test_compiler.test_static.elide_type_checks
+test_cinderx.test_compiler.test_static.enum
+test_cinderx.test_compiler.test_static.fields
+test_cinderx.test_compiler.test_static.final
+test_cinderx.test_compiler.test_static.fstring
+test_cinderx.test_compiler.test_static.implicit_none_return
+test_cinderx.test_compiler.test_static.imports
+test_cinderx.test_compiler.test_static.inference
+test_cinderx.test_compiler.test_static.invoke
+test_cinderx.test_compiler.test_static.lint
+test_cinderx.test_compiler.test_static.literals
+test_cinderx.test_compiler.test_static.match
+test_cinderx.test_compiler.test_static.mixin
+test_cinderx.test_compiler.test_static.module
+test_cinderx.test_compiler.test_static.narrowing
+test_cinderx.test_compiler.test_static.native
+test_cinderx.test_compiler.test_static.non_static_inheritance
+test_cinderx.test_compiler.test_static.obj_creation
+test_cinderx.test_compiler.test_static.overrides
+test_cinderx.test_compiler.test_static.patch
+test_cinderx.test_compiler.test_static.perf_lint
+test_cinderx.test_compiler.test_static.primitives
+test_cinderx.test_compiler.test_static.property
+test_cinderx.test_compiler.test_static.protocol
+test_cinderx.test_compiler.test_static.refine_fields
+test_cinderx.test_compiler.test_static.reflection
+test_cinderx.test_compiler.test_static.return_cast_insertion
+test_cinderx.test_compiler.test_static.runtime
+test_cinderx.test_compiler.test_static.sequence
+test_cinderx.test_compiler.test_static.slots_with_default
+test_cinderx.test_compiler.test_static.staticarray
+test_cinderx.test_compiler.test_static.staticmod
+test_cinderx.test_compiler.test_static.subclass
+test_cinderx.test_compiler.test_static.super
+test_cinderx.test_compiler.test_static.sys_hexversion
+test_cinderx.test_compiler.test_static.top_level
+test_cinderx.test_compiler.test_static.type_alias
+test_cinderx.test_compiler.test_static.type_params
+test_cinderx.test_compiler.test_static.typed_dict
+test_cinderx.test_compiler.test_static.union
+test_cinderx.test_compiler.test_static.unknown_names
+test_cinderx.test_compiler.test_static.variadic_arg
+test_cinderx.test_compiler.test_static.walrus_operator
+test_cinderx.test_compiler.test_strict
+test_cinderx.test_oss_quick
+test_cinderx.test_parallel_gc