fix: multiple applications of personalization when apply propositions is invoked

[vtsaplin]

… is invoked

[ramboz]

Heads-up: a series of fix PRs just merged into main (#20–#32) and this branch now has merge conflicts. Notably, #28 addressed the same double-application issue this PR targets, by serializing applyPropositions calls behind a re-entrancy guard with a trailing re-run (see applyPropositions/onDecoratedElement in src/index.js on main, plus the regression test "serializes concurrent proposition applications" in test/personalization-dom.test.js). Worth checking whether this PR is still needed after a rebase — if the guard covers your case, this can likely be closed; if it doesn't, the new test suite (npm test) is a good place to encode the remaining scenario.

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