update logic deciding how to apply importmap to js imports

[dmail]

No description provided.

[github-actions]

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Error: Error while trying to collect info after merging importmap_patch into main.

Error: Command failed: git fetch --no-tags --prune origin importmap_patch
fatal: couldn't find remote ref importmap_patch

    at ChildProcess.exithandler (node:child_process:422:12)
    at ChildProcess.emit (node:events:514:28)
    at maybeClose (node:internal/child_process:1105:16)
    at Socket. (node:internal/child_process:457:11)
    at Socket.emit (node:events:514:28)
    at Pipe. (node:net:337:12)

---

_{Generated by @jsenv/file-size-impact during file size impact#6784941064 on 1764ab5}

[github-actions]

---

Error: Error while trying to collect info after merging importmap_patch into main.

Error: Command failed: git fetch --no-tags --prune origin importmap_patch
fatal: couldn't find remote ref importmap_patch

    at ChildProcess.exithandler (node:child_process:422:12)
    at ChildProcess.emit (node:events:514:28)
    at maybeClose (node:internal/child_process:1105:16)
    at Socket. (node:internal/child_process:457:11)
    at Socket.emit (node:events:514:28)
    at Pipe. (node:net:337:12)

---

_{Generated by @jsenv/performance-impact during performance_impact#6784941058 on 1764ab5}