Is there any way to move above text into the below table's second cell in InDesign using JavaScript

Select the text frame and try to run this code:

var story = app.selection[0].parentStory;
var pgfs = story.paragraphs;

for (var i=0; i<pgfs.length; i++) {
    if (pgfs[i].tables.length == 0) continue;

    var table = pgfs[i].tables[0];
    var cell = table.rows[0].cells[1];
    var contents = pgfs[i].lines[0].contents;

    app.findTextPreferences = NothingEnum.NOTHING;
    app.changeTextPreferences = NothingEnum.NOTHING;
    app.findTextPreferences.findWhat = contents;
    app.changeTextPreferences.changeTo = '';
    pgfs[i].changeText();

    cell.contents = contents;
}

Or, even simpler solution without changeText():

var story = app.selection[0].parentStory;
var pgfs = story.paragraphs;

for (var i=0; i<pgfs.length; i++) {
    if (pgfs[i].tables.length == 0) continue;
    pgfs[i].tables[0].rows[0].cells[1].contents = pgfs[i].lines[0].contents;
    pgfs[i].lines[0].contents = '';
}

Update

To move the footnotes you can try this:

var story = app.selection[0].parentStory;
var pgfs = story.paragraphs;

app.findGrepPreferences = NothingEnum.NOTHING;
app.findGrepPreferences.findWhat = "footnote\\s+\\d+.+"; // <-- your GREP

for (var i=pgfs.length-1; i>=0; i--) {              // loop backward
    if (pgfs[i].tables.length == 0) continue;       // skip if no table
    var finds = pgfs[i].findGrep();
    if (finds.length == 0) continue;                // skip if noting was found
    pgfs[i].insertionPoints[-1].contents = finds[0].contents;
    finds[0].contents = '';
}

Before:

After: