Eliminate ERT test name clashes (bug#51941)

Eliminate ERT test name clashes (bug#51941)

* test/lisp/electric-tests.el (js-mode-braces-with-layout-and-indent):
* test/lisp/emacs-lisp/cl-lib-tests.el (cl-lib-test-fifth):
* test/lisp/thingatpt-tests.el (test-symbol-thing-2):
Remove duplicated tests.
* test/lisp/emacs-lisp/generator-tests.el (cps-loop):
* test/lisp/emacs-lisp/ring-tests.el (ring-tests-insert):
* test/lisp/help-tests.el (help-tests-substitute-command-keys/no-change):
* test/lisp/net/netrc-tests.el (test-netrc-credentials):
* test/lisp/progmodes/elisp-mode-tests.el
(elisp-completes-functions-after-let-bindings):
* test/lisp/thingatpt-tests.el (test-symbol-thing-3):
* test/src/buffer-tests.el (deftest-overlayp-1, buffer-tests--*):
* test/src/buffer-tests.el (test-buffer-swap-text-1):
* test/src/data-tests.el (binding-test-set-constant-nil)
(data-tests-logcount):
Rename clashing tests.