bug#56877: 29.0.50; Built-in packages are not always package-installed-p

[Matt Armstrong]

Before `package--initialized' is set non-nil a call to
(package-installed-p PACKAGE) returns nil for symbols naming built-in
packages. After `package--initialized' is non-nil the same call returns
non-nil.

I discovered this by accident when I figured out this use-package form
caused Emacs to contact GNU ELPA during startup:

(use-package project
  :ensure t
  ;; stuff)

For the above use-package calls (package-installed-p 'project), which
returns nil.  Use-package then attempts to install it using package.el,
which causes network activity, etc., and then package.el decides that it
is already installed.  This repeats each time I start Emacs.

There is code in `package-installed-p' that consults
`package-activated-list' when `package--initalized' is non-nil.  This is
the code path I am exercising.  We also have this FIXME:

(defvar package-activated-list nil
  ;; FIXME: This should implicitly include all builtin packages.
  "List of the names of currently activated packages.")

I have a fix prepared, which I will send once i have a bug number.


Configured using:
 'configure --with-native-compilation --with-pgtk'

Configured features:
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JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP
NOTIFY INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS XIM GTK3 ZLIB

Important settings:
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Major mode: ELisp/l

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Load-path shadows:
~/env/elisp/ol-notmuch hides 
/home/matt/.config/emacs/elpa/ol-notmuch-20220428.1337/ol-notmuch
/home/matt/.config/emacs/elpa/transient-20220717.1713/transient hides 
/home/matt/git/emacs-build/lisp/transient

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Memory information:
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