Flip symbolic macro flags
This enables `--experimental_enable_first_class_macros` and `--incompatible_simplify_unconditional_selects_in_rule_attrs` to true. The former releases Symbolic Macros, and with it, Finalizers and Macro-Aware Visibility. The latter is a quality-of-life improvement for macro users that is technically a breaking change: Any rule instantiated with an attribute value of `select({"//conditions:default": foo})` instead sees just `foo`.
Main milestone of #19922.
RELNOTES: Symbolic Macros -- and with them, Finalizers and the new Macro-Aware Visibility model -- are now generally available (`--experimental_enable_first_class_macros` now defaults to true). Trivial `select()` values are automatically unwrapped (`--incompatible_simplify_unconditional_selects_in_rule_attrs` now defaults to true).
PiperOrigin-RevId: 680779247
Change-Id: Icdbf4b47bc893ba61417eddc22c79d85b6f5d920
{Fast, Correct} - Choose two
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