SwNavigator: speed up footnote endnote content fill

Reduces the time to fill the footnote endnote content array by avoiding
SwFormatFootnote::GetFootnoteText which calls the somewhat time
consuming SwTextNode::GetExpandText. Just calling SwTextNode::GetText
to get the footnote endnote first paragraph text should be good enough
here.

Testing with debug and optimized builds on a test document with 6243
footnotes and endnotes shows a relative average differene of 10000 μs
between use of lcl_GetFootnoteText, introduced by this patch, versus
the current use of SwFormatFootnote::GetFootnoteText.

Change-Id: I6a870c0700a3e64348e5550a0fc129eabf1b1d44
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130182
Tested-by: Jenkins
Reviewed-by: Jim Raykowski <raykowj@gmail.com>

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